name: Publish Docker Image

# Two-phase split-base build pipeline for pi-devbox.
# Adapted from opencode-devbox/.gitea/workflows/docker-publish-split.yml
# (commit before v1.16.2). pi-devbox v1.0.0 introduces a self-contained
# build chain — base + variant Dockerfiles in this repo — so this
# workflow no longer depends on opencode-devbox CI.
#
# Pipeline shape:
#   1. base-decide      compute base hash from Dockerfile.base + rootfs/
#                       + entrypoints; probe Docker Hub for existing tag.
#   2. resolve-versions resolve pi @ npm 'latest', pi-fork/pi-obsmem refs
#                       to commit SHAs (defeats registry-buildcache
#                       cache-hit footgun on byte-identical build args).
#   3. build-base       only if probe missed; multi-arch push of base-<hash>.
#   4. smoke            amd64-only build of the variant FROMing the base
#                       tag; runs scripts/smoke-test.sh.
#   5. build-variant    multi-arch push of latest + vX.Y.Z tags.
#   6. promote-base-latest  re-tag base-<hash> → base-latest with `crane copy`.
#   7. update-description   patch Docker Hub description.

on:
  push:
    tags:
      - 'v*'
  workflow_dispatch:
    inputs:
      release_tag:
        description: 'Release tag to publish (e.g. v1.0.0). Used only for workflow_dispatch runs.'
        required: false
        default: ''
      promote_latest:
        description: 'Update latest aliases (default true for tag-push, false for manual test runs)'
        required: false
        default: 'false'

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: false

env:
  BUILDKIT_PROGRESS: plain
  IMAGE: ${{ vars.DOCKERHUB_USERNAME }}/pi-devbox
  RELEASE_TAG: ${{ github.ref_type == 'tag' && github.ref_name || inputs.release_tag }}
  PROMOTE_LATEST: ${{ github.ref_type == 'tag' && 'true' || inputs.promote_latest }}

jobs:
  # ── Phase 1: decide whether base needs rebuilding ──────────────────
  base-decide:
    runs-on: ubuntu-latest
    container:
      image: catthehacker/ubuntu:act-latest
    outputs:
      base_tag: ${{ steps.compute.outputs.base_tag }}
      need_build: ${{ steps.probe.outputs.need_build }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Compute base tag from Dockerfile.base + dependencies
        id: compute
        run: |
          # Hash inputs that determine the base image's contents.
          # Order is fixed via `find -print0 | sort -z` for reproducibility.
          # Junk filters: __pycache__/*.pyc and macOS metadata are gitignored
          # locally but still picked up by `find rootfs -type f` on a clean CI
          # checkout. Exclude them defensively.
          HASH=$(
            {
              cat Dockerfile.base
              find rootfs -type f \
                ! -path '*/__pycache__/*' \
                ! -name '*.pyc' \
                ! -name '.DS_Store' \
                ! -name '._*' \
                -print0 2>/dev/null | sort -z | xargs -0 cat 2>/dev/null
              cat entrypoint.sh entrypoint-user.sh
            } | sha256sum | cut -c1-12
          )
          BASE_TAG="base-${HASH}"
          echo "base_tag=${BASE_TAG}" >> "$GITHUB_OUTPUT"
          echo "Computed base tag: ${BASE_TAG}"

      - name: Force IPv4 for Docker Hub
        run: echo 'precedence ::ffff:0:0/96  100' >> /etc/gai.conf

      - name: Probe Docker Hub for existing base tag
        id: probe
        run: |
          set +e
          docker manifest inspect "${IMAGE}:${{ steps.compute.outputs.base_tag }}" \
            > /dev/null 2>&1
          PROBE_RC=$?
          set -e
          if [ "${PROBE_RC}" = "0" ]; then
            echo "need_build=false" >> "$GITHUB_OUTPUT"
            echo "Base tag ${IMAGE}:${{ steps.compute.outputs.base_tag }} exists — skipping rebuild."
          else
            echo "need_build=true" >> "$GITHUB_OUTPUT"
            echo "Base tag ${IMAGE}:${{ steps.compute.outputs.base_tag }} missing — will build."
          fi

  # ── Phase 1b: resolve floating versions to concrete refs ────────────
  # Without this, when PI_VERSION defaults to 'latest', the build-arg string
  # is byte-identical across builds → identical layer hash → registry
  # buildcache silently reuses the layer from whatever pi version was
  # current when the cache was first populated. Same class of bug as
  # pi-devbox v0.74.0..v0.75.5 (fixed in v0.75.5b 2026-05-23).
  resolve-versions:
    runs-on: ubuntu-latest
    container:
      image: catthehacker/ubuntu:act-latest
    outputs:
      pi_version: ${{ steps.resolve.outputs.pi_version }}
      fork_ref: ${{ steps.resolve.outputs.fork_ref }}
      obsmem_ref: ${{ steps.resolve.outputs.obsmem_ref }}
      toolkit_ref: ${{ steps.resolve.outputs.toolkit_ref }}
      extensions_ref: ${{ steps.resolve.outputs.extensions_ref }}
      studio_ref: ${{ steps.resolve.outputs.studio_ref }}
    steps:
      - name: Resolve pi version + companion refs
        id: resolve
        run: |
          set -eu
          # Query npm registry directly; catthehacker/ubuntu:act-latest's npm
          # is not reliably on PATH in act_runner job containers.
          PI_VERSION=$(curl -sf "https://registry.npmjs.org/@earendil-works%2Fpi-coding-agent/latest" | jq -r '.version')
          echo "pi_version=${PI_VERSION}" >> "$GITHUB_OUTPUT"
          # Resolve pi-fork / pi-observational-memory git refs to commit
          # SHAs so the build-arg string changes whenever upstream moves.
          FORK_REF=$(curl -sf -H "Accept: application/vnd.github.sha" \
            "https://api.github.com/repos/elpapi42/pi-fork/commits/master" || echo "master")
          OBSMEM_REF=$(curl -sf -H "Accept: application/vnd.github.sha" \
            "https://api.github.com/repos/elpapi42/pi-observational-memory/commits/master" || echo "master")
          [ -n "$FORK_REF" ]   || FORK_REF=master
          [ -n "$OBSMEM_REF" ] || OBSMEM_REF=master
          echo "fork_ref=${FORK_REF}"     >> "$GITHUB_OUTPUT"
          echo "obsmem_ref=${OBSMEM_REF}" >> "$GITHUB_OUTPUT"
          # Also resolve pi-toolkit / pi-extensions main HEADs to SHAs so a
          # workflow_dispatch re-run produces byte-identical images when
          # those repos haven't moved (and a clean diff in build-arg strings
          # when they have, defeating the registry buildcache footgun).
          # Gitea API requires auth even for public-repo commit listing.
          TOOLKIT_REF=$(curl -sf -H "Authorization: token ${GITEA_BUILD_TOKEN:-${GITHUB_TOKEN:-}}" \
            "https://gitea.jordbo.se/api/v1/repos/joakimp/pi-toolkit/commits?limit=1&sha=main" \
            | jq -r '.[0].sha // "main"' 2>/dev/null || echo "main")
          EXTENSIONS_REF=$(curl -sf -H "Authorization: token ${GITEA_BUILD_TOKEN:-${GITHUB_TOKEN:-}}" \
            "https://gitea.jordbo.se/api/v1/repos/joakimp/pi-extensions/commits?limit=1&sha=main" \
            | jq -r '.[0].sha // "main"' 2>/dev/null || echo "main")
          [ -n "$TOOLKIT_REF" ]    || TOOLKIT_REF=main
          [ -n "$EXTENSIONS_REF" ] || EXTENSIONS_REF=main
          echo "toolkit_ref=${TOOLKIT_REF}"        >> "$GITHUB_OUTPUT"
          echo "extensions_ref=${EXTENSIONS_REF}"  >> "$GITHUB_OUTPUT"
          # Resolve pi-studio (omaclaren/pi-studio) main HEAD to a SHA for
          # the :latest-studio variant — same cache-busting rationale.
          STUDIO_REF=$(curl -sf -H "Accept: application/vnd.github.sha" \
            "https://api.github.com/repos/omaclaren/pi-studio/commits/main" || echo "main")
          [ -n "$STUDIO_REF" ] || STUDIO_REF=main
          echo "studio_ref=${STUDIO_REF}" >> "$GITHUB_OUTPUT"
          echo "Resolved PI_VERSION=${PI_VERSION}"
          echo "Resolved PI_FORK_REF=${FORK_REF}, PI_OBSMEM_REF=${OBSMEM_REF}"
          echo "Resolved PI_TOOLKIT_REF=${TOOLKIT_REF}, PI_EXTENSIONS_REF=${EXTENSIONS_REF}"
          echo "Resolved PI_STUDIO_REF=${STUDIO_REF}"

  # ── Phase 2: build & push base (multi-arch), only when needed ──────
  build-base:
    needs: [base-decide]
    if: needs.base-decide.outputs.need_build == 'true'
    runs-on: ubuntu-latest
    container:
      image: catthehacker/ubuntu:act-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Force IPv4 for Docker Hub
        run: echo 'precedence ::ffff:0:0/96  100' >> /etc/gai.conf
      - name: Reclaim runner disk
        run: |
          set -x
          df -h / || true
          rm -rf \
            /opt/hostedtoolcache /opt/microsoft /opt/az /opt/ghc \
            /usr/local/.ghcup /usr/share/dotnet /usr/share/swift \
            /usr/local/lib/android /usr/local/share/powershell \
            /usr/local/share/chromium /usr/local/share/boost \
            /usr/lib/jvm 2>/dev/null || true
          apt-get clean || true
          rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* || true
          docker system prune -af --volumes || true
          docker builder prune -af || true
          df -h / || true
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
        with:
          platforms: arm64
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4
        with:
          driver-opts: network=host
      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ vars.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      - name: Build and push base (multi-arch) — with retry
        shell: bash
        env:
          BASE_TAG_FULL: ${{ env.IMAGE }}:${{ needs.base-decide.outputs.base_tag }}
        run: |
          set -euo pipefail
          # 3-attempt retry around `docker buildx build --push` for transient
          # registry-1.docker.io blips. Does NOT mask deterministic failures.
          # Registry cache disabled: buildkit cache-export hits HTTP 400 from
          # Hub CDN since ~2026-05-23. Image push itself works; we pay full
          # base build on Dockerfile.base change, but the base tag is content-
          # addressed so unchanged bases short-circuit at the probe step.
          for attempt in 1 2 3; do
            echo "==> Build+push attempt ${attempt}/3"
            if docker buildx build \
                --platform linux/amd64,linux/arm64 \
                --file Dockerfile.base \
                --push \
                --tag "${BASE_TAG_FULL}" \
                .; then
              echo "==> Attempt ${attempt} succeeded"
              exit 0
            fi
            if [[ "${attempt}" -lt 3 ]]; then
              backoff=$(( attempt * 15 ))
              echo "==> Attempt ${attempt} failed, sleeping ${backoff}s before retry"
              sleep "${backoff}"
            fi
          done
          echo "==> All 3 build+push attempts failed"
          exit 1

  # ── Phase 3: amd64 smoke (gates the multi-arch publish) ─────────────
  smoke:
    needs: [base-decide, build-base, resolve-versions]
    if: |
      always() &&
      needs.base-decide.result == 'success' &&
      needs.resolve-versions.result == 'success' &&
      (needs.build-base.result == 'success' || needs.build-base.result == 'skipped')
    runs-on: ubuntu-latest
    container:
      image: catthehacker/ubuntu:act-latest
    steps:
      - uses: actions/checkout@v4
      - name: Force IPv4 for Docker Hub
        run: echo 'precedence ::ffff:0:0/96  100' >> /etc/gai.conf
      - name: Reclaim runner disk
        run: |
          rm -rf /opt/hostedtoolcache /opt/microsoft /opt/az /opt/ghc \
            /usr/local/.ghcup /usr/share/dotnet /usr/share/swift \
            /usr/local/lib/android /usr/local/share/powershell \
            /usr/local/share/chromium /usr/local/share/boost \
            /usr/lib/jvm 2>/dev/null || true
          docker system prune -af --volumes || true
          docker builder prune -af || true
      - uses: docker/setup-buildx-action@v4
        with: {driver-opts: network=host}
      - uses: docker/login-action@v3
        with:
          username: ${{ vars.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      - name: Build amd64 variant for smoke
        uses: docker/build-push-action@v7
        with:
          context: .
          file: Dockerfile.variant
          platforms: linux/amd64
          push: false
          load: true
          tags: pi-devbox:smoke
          build-args: |
            BASE_IMAGE=${{ env.IMAGE }}:${{ needs.base-decide.outputs.base_tag }}
            PI_VERSION=${{ needs.resolve-versions.outputs.pi_version }}
            PI_FORK_REF=${{ needs.resolve-versions.outputs.fork_ref }}
            PI_OBSMEM_REF=${{ needs.resolve-versions.outputs.obsmem_ref }}
            PI_TOOLKIT_REF=${{ needs.resolve-versions.outputs.toolkit_ref }}
            PI_EXTENSIONS_REF=${{ needs.resolve-versions.outputs.extensions_ref }}
      - name: Smoke test (amd64)
        env:
          EXPECTED_PI_VERSION: ${{ needs.resolve-versions.outputs.pi_version }}
        run: bash scripts/smoke-test.sh pi-devbox:smoke

  # ── Phase 3b: amd64 smoke for the studio variant ────────────────────
  # Additive + independent of the core `smoke` job: gates ONLY
  # build-variant-studio, never the core build-variant. A studio build or
  # smoke failure therefore cannot block the :latest / :vX.Y.Z release.
  smoke-studio:
    needs: [base-decide, build-base, resolve-versions]
    if: |
      always() &&
      needs.base-decide.result == 'success' &&
      needs.resolve-versions.result == 'success' &&
      (needs.build-base.result == 'success' || needs.build-base.result == 'skipped')
    runs-on: ubuntu-latest
    container:
      image: catthehacker/ubuntu:act-latest
    steps:
      - uses: actions/checkout@v4
      - name: Force IPv4 for Docker Hub
        run: echo 'precedence ::ffff:0:0/96  100' >> /etc/gai.conf
      - name: Reclaim runner disk
        run: |
          rm -rf /opt/hostedtoolcache /opt/microsoft /opt/az /opt/ghc \
            /usr/local/.ghcup /usr/share/dotnet /usr/share/swift \
            /usr/local/lib/android /usr/local/share/powershell \
            /usr/local/share/chromium /usr/local/share/boost \
            /usr/lib/jvm 2>/dev/null || true
          docker system prune -af --volumes || true
          docker builder prune -af || true
      - uses: docker/setup-buildx-action@v4
        with: {driver-opts: network=host}
      - uses: docker/login-action@v3
        with:
          username: ${{ vars.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      - name: Build amd64 studio variant for smoke
        uses: docker/build-push-action@v7
        with:
          context: .
          file: Dockerfile.variant
          platforms: linux/amd64
          push: false
          load: true
          tags: pi-devbox:smoke-studio
          build-args: |
            BASE_IMAGE=${{ env.IMAGE }}:${{ needs.base-decide.outputs.base_tag }}
            PI_VERSION=${{ needs.resolve-versions.outputs.pi_version }}
            PI_FORK_REF=${{ needs.resolve-versions.outputs.fork_ref }}
            PI_OBSMEM_REF=${{ needs.resolve-versions.outputs.obsmem_ref }}
            PI_TOOLKIT_REF=${{ needs.resolve-versions.outputs.toolkit_ref }}
            PI_EXTENSIONS_REF=${{ needs.resolve-versions.outputs.extensions_ref }}
            INSTALL_STUDIO=true
            PI_STUDIO_REF=${{ needs.resolve-versions.outputs.studio_ref }}
      - name: Smoke test studio (amd64)
        env:
          EXPECTED_PI_VERSION: ${{ needs.resolve-versions.outputs.pi_version }}
        run: bash scripts/smoke-test.sh pi-devbox:smoke-studio

  # ── Phase 4: multi-arch publish ─────────────────────────────────────
  build-variant:
    needs: [base-decide, smoke, resolve-versions]
    runs-on: ubuntu-latest
    container:
      image: catthehacker/ubuntu:act-latest
    steps:
      - uses: actions/checkout@v4
      - run: echo 'precedence ::ffff:0:0/96  100' >> /etc/gai.conf
      - run: |
          rm -rf /opt/hostedtoolcache /opt/microsoft /opt/az /opt/ghc \
            /usr/local/.ghcup /usr/share/dotnet /usr/share/swift \
            /usr/local/lib/android /usr/local/share/powershell \
            /usr/local/share/chromium /usr/local/share/boost \
            /usr/lib/jvm 2>/dev/null || true
          docker system prune -af --volumes || true
          docker builder prune -af || true
      - uses: docker/setup-qemu-action@v3
        with: {platforms: arm64}
      - uses: docker/setup-buildx-action@v4
        with: {driver-opts: network=host}
      - uses: docker/login-action@v3
        with:
          username: ${{ vars.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      - name: Compute version-specific tags
        id: tags
        run: |
          VERSION="${{ env.RELEASE_TAG }}"
          { echo "tags<<EOF"
            echo "${IMAGE}:${VERSION}"
            if [ "${{ env.PROMOTE_LATEST }}" = "true" ]; then
              echo "${IMAGE}:latest"
            fi
            echo "EOF"
          } >> "$GITHUB_OUTPUT"
      - name: Build and push variant (with retry)
        shell: bash
        env:
          TAGS: ${{ steps.tags.outputs.tags }}
          BASE_IMAGE_FULL: ${{ env.IMAGE }}:${{ needs.base-decide.outputs.base_tag }}
          PI_VERSION: ${{ needs.resolve-versions.outputs.pi_version }}
          FORK_REF: ${{ needs.resolve-versions.outputs.fork_ref }}
          OBSMEM_REF: ${{ needs.resolve-versions.outputs.obsmem_ref }}
          TOOLKIT_REF: ${{ needs.resolve-versions.outputs.toolkit_ref }}
          EXTENSIONS_REF: ${{ needs.resolve-versions.outputs.extensions_ref }}
        run: |
          set -euo pipefail
          TAG_FLAGS=()
          while IFS= read -r t; do [[ -n "$t" ]] && TAG_FLAGS+=( -t "$t" ); done <<< "${TAGS}"
          # 3-attempt retry (see build-base step for rationale).
          for attempt in 1 2 3; do
            echo "==> Build+push attempt ${attempt}/3"
            if docker buildx build \
                --platform linux/amd64,linux/arm64 \
                --file Dockerfile.variant \
                --push \
                --build-arg "BASE_IMAGE=${BASE_IMAGE_FULL}" \
                --build-arg "PI_VERSION=${PI_VERSION}" \
                --build-arg "PI_FORK_REF=${FORK_REF}" \
                --build-arg "PI_OBSMEM_REF=${OBSMEM_REF}" \
                --build-arg "PI_TOOLKIT_REF=${TOOLKIT_REF}" \
                --build-arg "PI_EXTENSIONS_REF=${EXTENSIONS_REF}" \
                "${TAG_FLAGS[@]}" \
                .; then
              echo "==> Attempt ${attempt} succeeded"
              exit 0
            fi
            if [[ "${attempt}" -lt 3 ]]; then
              backoff=$(( attempt * 15 ))
              echo "==> Attempt ${attempt} failed, sleeping ${backoff}s before retry"
              sleep "${backoff}"
            fi
          done
          echo "==> All 3 build+push attempts failed"
          exit 1

  # ── Phase 4b: multi-arch publish of the studio variant ───────────────
  # Additive: publishes :vX.Y.Z-studio (+ :latest-studio on release). Gated
  # on its own smoke-studio, NOT on the core build-variant, so it can ship
  # or fail independently of the core release.
  build-variant-studio:
    needs: [base-decide, smoke-studio, resolve-versions]
    runs-on: ubuntu-latest
    container:
      image: catthehacker/ubuntu:act-latest
    steps:
      - uses: actions/checkout@v4
      - run: echo 'precedence ::ffff:0:0/96  100' >> /etc/gai.conf
      - run: |
          rm -rf /opt/hostedtoolcache /opt/microsoft /opt/az /opt/ghc \
            /usr/local/.ghcup /usr/share/dotnet /usr/share/swift \
            /usr/local/lib/android /usr/local/share/powershell \
            /usr/local/share/chromium /usr/local/share/boost \
            /usr/lib/jvm 2>/dev/null || true
          docker system prune -af --volumes || true
          docker builder prune -af || true
      - uses: docker/setup-qemu-action@v3
        with: {platforms: arm64}
      - uses: docker/setup-buildx-action@v4
        with: {driver-opts: network=host}
      - uses: docker/login-action@v3
        with:
          username: ${{ vars.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      - name: Compute studio version-specific tags
        id: tags
        run: |
          VERSION="${{ env.RELEASE_TAG }}"
          { echo "tags<<EOF"
            echo "${IMAGE}:${VERSION}-studio"
            if [ "${{ env.PROMOTE_LATEST }}" = "true" ]; then
              echo "${IMAGE}:latest-studio"
            fi
            echo "EOF"
          } >> "$GITHUB_OUTPUT"
      - name: Build and push studio variant (with retry)
        shell: bash
        env:
          TAGS: ${{ steps.tags.outputs.tags }}
          BASE_IMAGE_FULL: ${{ env.IMAGE }}:${{ needs.base-decide.outputs.base_tag }}
          PI_VERSION: ${{ needs.resolve-versions.outputs.pi_version }}
          FORK_REF: ${{ needs.resolve-versions.outputs.fork_ref }}
          OBSMEM_REF: ${{ needs.resolve-versions.outputs.obsmem_ref }}
          TOOLKIT_REF: ${{ needs.resolve-versions.outputs.toolkit_ref }}
          EXTENSIONS_REF: ${{ needs.resolve-versions.outputs.extensions_ref }}
          STUDIO_REF: ${{ needs.resolve-versions.outputs.studio_ref }}
        run: |
          set -euo pipefail
          TAG_FLAGS=()
          while IFS= read -r t; do [[ -n "$t" ]] && TAG_FLAGS+=( -t "$t" ); done <<< "${TAGS}"
          # 3-attempt retry (see build-base step for rationale).
          for attempt in 1 2 3; do
            echo "==> Build+push attempt ${attempt}/3"
            if docker buildx build \
                --platform linux/amd64,linux/arm64 \
                --file Dockerfile.variant \
                --push \
                --build-arg "BASE_IMAGE=${BASE_IMAGE_FULL}" \
                --build-arg "PI_VERSION=${PI_VERSION}" \
                --build-arg "PI_FORK_REF=${FORK_REF}" \
                --build-arg "PI_OBSMEM_REF=${OBSMEM_REF}" \
                --build-arg "PI_TOOLKIT_REF=${TOOLKIT_REF}" \
                --build-arg "PI_EXTENSIONS_REF=${EXTENSIONS_REF}" \
                --build-arg "INSTALL_STUDIO=true" \
                --build-arg "PI_STUDIO_REF=${STUDIO_REF}" \
                "${TAG_FLAGS[@]}" \
                .; then
              echo "==> Attempt ${attempt} succeeded"
              exit 0
            fi
            if [[ "${attempt}" -lt 3 ]]; then
              backoff=$(( attempt * 15 ))
              echo "==> Attempt ${attempt} failed, sleeping ${backoff}s before retry"
              sleep "${backoff}"
            fi
          done
          echo "==> All 3 build+push attempts failed"
          exit 1

  # ── Phase 5: promote base-<hash> → base-latest (manifest copy only) ─
  promote-base-latest:
    needs:
      - base-decide
      - build-variant
    # Skip on cache-hit base builds: when need_build=false, base-latest
    # already points at the same digest as base-<hash>, so the retag is
    # a tautology and any transient failure of it is purely cosmetic.
    # Manual workflow_dispatch with promote_latest=true overrides this
    # gate as an escape hatch (e.g., if base-latest got hand-deleted).
    if: |
      always() &&
      needs.build-variant.result == 'success' &&
      (inputs.promote_latest == 'true' ||
       (github.ref_type == 'tag' && needs.base-decide.outputs.need_build == 'true'))
    runs-on: ubuntu-latest
    container:
      image: catthehacker/ubuntu:act-latest
    steps:
      # Direct pinned install instead of imjasonh/setup-crane@v0.4. The
      # action's bootstrap script periodically rate-limits on
      # api.github.com/.../releases/latest. Pinning removes the runtime
      # dependency on GitHub API entirely.
      - name: Install crane (pinned)
        env:
          CRANE_VERSION: v0.21.6
        run: |
          set -eux
          curl -fsSL "https://github.com/google/go-containerregistry/releases/download/${CRANE_VERSION}/go-containerregistry_Linux_x86_64.tar.gz" \
            | tar -xz -C /usr/local/bin crane
          crane version
      - name: Login (crane)
        run: |
          crane auth login docker.io \
            -u ${{ vars.DOCKERHUB_USERNAME }} \
            -p "${{ secrets.DOCKERHUB_TOKEN }}"
      - name: Re-tag base-<hash> as base-latest
        run: |
          crane copy \
            ${{ env.IMAGE }}:${{ needs.base-decide.outputs.base_tag }} \
            ${{ env.IMAGE }}:base-latest

  # ── Phase 6: update Hub description (only on real release runs) ────
  update-description:
    needs: [build-variant, resolve-versions]
    if: |
      always() &&
      needs.build-variant.result == 'success' &&
      (github.ref_type == 'tag' || inputs.promote_latest == 'true')
    runs-on: ubuntu-latest
    container:
      image: catthehacker/ubuntu:act-latest
    steps:
      - uses: actions/checkout@v4
      - name: Update Docker Hub description
        env:
          PI_VERSION: ${{ needs.resolve-versions.outputs.pi_version }}
        run: |
          # Substitute {{PI_VERSION}} placeholders in DOCKER_HUB.md so the
          # Hub page always shows which pi version is in :latest. The
          # placeholder lives in DOCKER_HUB.md (committed); CI fills it
          # at publish time using the same resolved version that was
          # baked into the variant image. No drift between page and image.
          if [ -z "${PI_VERSION}" ]; then
            echo "::error::PI_VERSION env var is empty. Likely cause: the"
            echo "::error::update-description job is missing 'resolve-versions'"
            echo "::error::in its needs: list, so needs.resolve-versions.outputs.pi_version"
            echo "::error::resolves to an empty string instead of the actual version."
            exit 1
          fi
          cp DOCKER_HUB.md /tmp/hub-full.md
          sed -i "s/{{PI_VERSION}}/${PI_VERSION}/g" /tmp/hub-full.md
          if grep -q '{{PI_VERSION}}' /tmp/hub-full.md; then
            echo "::error::DOCKER_HUB.md still contains unsubstituted {{PI_VERSION}} markers"
            exit 1
          fi
          TOKEN=$(curl -s -X POST https://hub.docker.com/v2/auth/token \
            -H "Content-Type: application/json" \
            -d '{"identifier":"${{ vars.DOCKERHUB_USERNAME }}","secret":"${{ secrets.DOCKERHUB_TOKEN }}"}' \
            | jq -r .access_token)
          if [ "$TOKEN" = "null" ] || [ -z "$TOKEN" ]; then
            echo "::error::Failed to authenticate with Docker Hub API"
            exit 1
          fi
          HTTP_CODE=$(jq -n \
            --rawfile full /tmp/hub-full.md \
            --arg short "Linux container with the pi coding-agent, MemPalace, and curated dev tooling." \
            '{"full_description": $full, "description": $short}' | \
            curl -s -o /tmp/hub-response.txt -w "%{http_code}" -X PATCH \
              "https://hub.docker.com/v2/repositories/${{ vars.DOCKERHUB_USERNAME }}/pi-devbox/" \
              -H "Authorization: Bearer $TOKEN" \
              -H "Content-Type: application/json" \
              -d @-)
          if [ "$HTTP_CODE" != "200" ]; then
            echo "Response body:"
            cat /tmp/hub-response.txt
            echo "::error::Docker Hub description update failed with HTTP $HTTP_CODE"
            exit 1
          fi
          echo "Description updated (pi version: ${PI_VERSION})."