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Checks if the image tag exists before building. New versions added to the matrix get built, existing ones are skipped. Manual workflow dispatch with force=true rebuilds everything.
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Pull request overview
This PR updates the Ruby container image GitHub Actions workflow to avoid rebuilding/pushing GHCR images when a given Ruby-version tag already exists, with an override to rebuild everything on manual dispatch.
Changes:
- Add a
workflow_dispatchboolean inputforceto rebuild all images on demand. - Add a pre-build step that checks GHCR for an existing tag via
docker buildx imagetools inspect. - Gate
docker/login-actionanddocker/build-push-actionbehind the “tag missing OR force” condition.
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On PRs and pushes, only build versions that don't exist in GHCR yet. If the Dockerfile itself changed, rebuild all versions to validate (without pushing on PRs).
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Summary
Recently changes so updates to the ruby version matrix would trigger builds. I then noticed all versions got rebuilt. I think this makes sense:
ruby/Dockerfilechanges (validated without pushing on PRs)forceinput to workflow_dispatch for manual full rebuildsBehavior