ci: keep the Docker build working on fork pull requests - #122
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Repository variables are not exposed to pull_request runs originating from a fork, so vars.DOCKERHUB_ID resolved to an empty string and docker/metadata-action emitted "/chainbench:pr-N". buildx rejects that as an invalid reference, so the job failed before reading the Dockerfile and never validated the image build. Fall back to a placeholder image name when the variable is unset. PR runs never push (push is gated on the event type and the registry login step is skipped), so the name only has to be syntactically valid.
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📝 WalkthroughWalkthroughThe Docker metadata workflow now uses ChangesDocker publish workflow
Estimated code review effort: 2 (Simple) | ~5 minutes Merge Risk: 🟡 Moderate · up to The workflow could publish release images to the placeholder chainbench-ci/chainbench namespace when the Docker Hub variable is unavailable, instead of the intended release image location. Merge should wait until the fallback is limited to pull requests. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In @.github/workflows/docker-publish.yml:
- Around line 34-35: Update the image reference expression in the workflow’s
Docker metadata configuration so the chainbench-ci fallback is selected only
when the event is pull_request; for release events, use vars.DOCKERHUB_ID
without substituting the placeholder.
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.github/workflows/docker-publish.yml
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The placeholder only exists so fork pull requests, which never push, can produce a syntactically valid tag. Applying it on release events would turn a missing DOCKERHUB_ID from a tag-validation failure into a push under a name we do not own, so keep releases on the variable alone.
The step names and keys already say what these lines said. Keep only the note on the image expression, whose reason is not visible from the code.
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Problem
The
Dockerworkflow fails on every pull request opened from a fork, before Docker ever reads theDockerfile.docker/metadata-actionbuilds the image name from${{ vars.DOCKERHUB_ID }}/chainbench. Repository variables — like secrets — are not exposed topull_requestruns originating from a fork, so the expression resolves to an empty string and the action emits:buildx rejects the reference and the job dies at the
Build and pushstep. Nothing in theDockerfileis executed, so thebuildcheck is a false negative: it reports failure regardless of the change, and it never validates the image for external contributors.Seen on #121 (run), which is the first fork PR to touch the
Dockerfile. Internal PRs are unaffected because the variable resolves there.Fix
Fall back to a placeholder image name on pull requests when the variable is unset:
chainbench-ciThe placeholder is safe on pull requests because they never push:
pushis already gated ongithub.event_name != 'pull_request'and the registry login step is already skipped for PRs. The name only has to be syntactically valid.Releases deliberately keep
vars.DOCKERHUB_IDon its own. Substituting a placeholder there would turn a missing variable from an obvious tag-validation failure into a push attempt under a namespace we do not own — Docker Hub would deny it, but failing at the tag is the clearer signal.Effect
Fork PRs now run the real build with
push: false, so the image is genuinely compiled and the check becomes meaningful for external contributions.Since
pull_requestworkflows run from the merge ref, #121 picks this up automatically once it lands — no rebase needed from the contributor.Testing
Workflow YAML parses and the expression is preserved. The behaviour itself is only observable on a fork PR run; this PR is internal, so its own
buildcheck exercises the unchanged path (variable present).Summary by CodeRabbit
Documentation
Bug Fixes