feat(ci): attest build provenance#287
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Add GitHub native build-provenance attestation to the GHCR publish workflow. The minimal (:sha/:latest) and :full images are built and pushed with nerdctl, which has no --digestfile; each image's real sha256 digest is read back from the registry with skopeo after push and each gets its own attestation via actions/attest-build-provenance. The job already declared id-token/attestations permissions; this wires the actual attestation steps. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Estate attestation rollout
Adds GitHub native build-provenance attestation to
.github/workflows/ghcr-publish.yml.Push mechanism: nerdctl (
nerdctl build+nerdctl pushto ghcr.io). This workflow pushes two distinct artifacts: the minimal image (:${{ github.sha }}/:latest, from.containerization/Containerfile) and the:fullimage (from.containerization/Containerfile.full).How the digest is obtained:
nerdctl pushhas no--digestfileflag, so after the pushes the workflow reads each image's realsha256:...digest back from the registry withskopeo inspect --format '{{.Digest}}'(pre-installed onubuntu-latest), authenticating withGITHUB_TOKEN. Because the minimal and full images are different artifacts with different digests, each gets its own attestation step.Changes:
id-token: write+attestations: write— no permission change needed.skopeo inspect.actions/attest-build-provenance@e8998f94…(v2, pinned) steps (minimal + full), both withpush-to-registry: true.Verify with:
🤖 Generated with Claude Code