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Add reusable publish workflow (build, publish, sign) - #1
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Two jobs: build runs the caller's Dockerfile without credentials; publish runs no caller code, pushes only the OCI data and signs the digest with keyless cosign. Each caller passes its own workload identity provider, service account and image; the workflow sets no identity. Also: CODEOWNERS, Dependabot for actions, actionlint + zizmor on PRs.
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Adds
.github/workflows/publish.yml, a reusable workflow that builds a container image, publishes it and signs it.build: checks out the caller at the triggering commit and builds an OCI archive. It has no OIDC token and no registry credentials. It runs in<environment>-build.publish: runs no caller code. It pushes only the OCI data frombuildwith crane, through workload identity federation, and signs the digest with keyless cosign. It runs in<environment>.workload-identity-provider,service-accountandimage. The workflow sets no identity of its own.<sha>-<UTC timestamp>, with aprod-prefix forproduction.Also: CODEOWNERS, Dependabot for actions, and actionlint + zizmor on PRs.
Versions: callers pin
@v1. A release is a PR frommainintov1, plus av1.x.ytag (see README).