Both published variants inherited Dockerfile.base's
description="pi-devbox — base image (variant-independent)", so v1.6.4 and
v1.6.4-studio both advertised themselves on Docker Hub as the base image —
misleading, and useless for telling the two apart.
A LABEL cannot branch on INSTALL_STUDIO, so the text arrives as a build-arg:
CI passes a variant-specific string (interpolating RELEASE_TAG, PI_VERSION and,
for studio, STUDIO_TAG), and the Dockerfile default keeps a bare local
`docker build -f Dockerfile.variant` honest instead of misleading.
Also sets org.opencontainers.image.title/description alongside the legacy bare
`description` key, so Hub and OCI-aware tooling both see it. ARGs stay in the
last-declared block, so the label layer is still the only thing invalidated.
Verified: hadolint 2.14.0 (the CI-pinned version) clean on both Dockerfiles;
workflow YAML parses; check-workflow-shell.sh passes. Lands on the next release.
joakimp
1fd524e7fb