feat: add static base image build for Tekton Go binaries#3221
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waveywaves wants to merge 1 commit intotektoncd:mainfrom
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feat: add static base image build for Tekton Go binaries#3221waveywaves wants to merge 1 commit intotektoncd:mainfrom
waveywaves wants to merge 1 commit intotektoncd:mainfrom
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Add apko-based build for a multi-arch static base image supporting amd64, arm64, s390x, and ppc64le. This replaces the dependency on cgr.dev/chainguard/static which is pinned to an EOL Alpine 3.18 digest and whose free tier dropped s390x/ppc64le support. The image contains CA certificates, timezone data, nsswitch.conf, and a nonroot user (UID 65532). A weekly GitHub Actions workflow rebuilds and publishes to ghcr.io/tektoncd/plumbing/static-base. All Tekton repos (pipeline, triggers, chains, results) can reference this as their defaultBaseImage in .ko.yaml. Related: tektoncd/pipeline#9557
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The apko build and CI workflow belong in tektoncd/plumbing since all Tekton repos need the same base image. Update .ko.yaml and publish.yaml to reference ghcr.io/tektoncd/plumbing/static-base instead. See: tektoncd/plumbing#3221
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Add apko-based build for a multi-arch static base image supporting amd64, arm64, s390x, and ppc64le.
Why: All Tekton repos currently depend on
cgr.dev/chainguard/staticwhich is pinned to an EOL Alpine 3.18 digest from Nov 2023. The Chainguard free tier dropped s390x/ppc64le support, so bumping the digest breaks release builds. Building our own image gives us control over architecture coverage and update cadence.What this adds:
images/static-base/apko.yaml— declarative image definition, builds a ~300KB static base per arch with CA certs, timezone data, and nonroot user.github/workflows/build-static-base-image.yaml— weekly CI to rebuild and publish toghcr.io/tektoncd/plumbing/static-baseimages/static-base/README.md— documents contents, build instructions, and consumersConsumers: tektoncd/pipeline, tektoncd/triggers, tektoncd/chains, tektoncd/results — all can reference
ghcr.io/tektoncd/plumbing/static-baseas theirdefaultBaseImagein.ko.yaml.Related: tektoncd/pipeline#9557
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