Add Docker Hub description update step to CI workflow

.gitea/workflows/docker-publish.yml

@@ -41,3 +41,19 @@ jobs:
           tags: |
             ${{ vars.DOCKERHUB_USERNAME }}/opencode-devbox:${{ steps.version.outputs.version }}
             ${{ vars.DOCKERHUB_USERNAME }}/opencode-devbox:latest
+
+      - name: Update Docker Hub description
+        run: |
+          TOKEN=$(curl -s -X POST https://hub.docker.com/v2/users/login/ \
+            -H "Content-Type: application/json" \
+            -d '{"username":"${{ vars.DOCKERHUB_USERNAME }}","password":"${{ secrets.DOCKERHUB_TOKEN }}"}' \
+            | jq -r .token)
+          jq -n \
+            --arg full "$(cat DOCKER_HUB.md)" \
+            --arg short "Portable AI dev environment for opencode. Debian-based with git, Node.js, AWS CLI, and SSH support." \
+            '{"full_description": $full, "description": $short}' | \
+            curl -s -o /dev/null -w "%{http_code}" -X PATCH \
+              "https://hub.docker.com/v2/repositories/${{ vars.DOCKERHUB_USERNAME }}/opencode-devbox/" \
+              -H "Authorization: JWT $TOKEN" \
+              -H "Content-Type: application/json" \
+              -d @-