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ci: mirror published multi-arch images to GHCR #224 #230

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43 changes: 43 additions & 0 deletions .github/workflows/docker-release.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ permissions:
id-token: write
attestations: write
artifact-metadata: write
packages: write

concurrency:
group: docker-release
Expand Down Expand Up @@ -200,6 +201,13 @@ jobs:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}

- name: Login to GitHub Container Registry
uses: docker/login-action@v4
with:
registry: ghcr.io
username: ${{ github.actor }}
password: ${{ secrets.GITHUB_TOKEN }}

- name: Install Syft
uses: anchore/sbom-action/download-syft@e22c389904149dbc22b58101806040fa8d37a610 # v0.24.0
with:
Expand Down Expand Up @@ -348,6 +356,41 @@ jobs:
fi
echo "SILO_DISTROLESS_DIGEST=${DISTROLESS_RELEASE_DIGEST}" >> "${GITHUB_ENV}"

# Mirror the published multi-architecture manifests to GHCR.
# `imagetools create` copies the existing manifests and blobs
# registry-to-registry, so the GHCR tags resolve to the exact same
# digests as Docker Hub -- no rebuild, no drift. Architecture-suffixed
# staging tags stay Docker-Hub-only; only the four promoted tags are
# mirrored. Attestations keep their index.docker.io subject names;
# verification against the mirrored digests still works by passing the
# Docker Hub subject registry explicitly.
- name: Mirror multi-architecture manifests to GHCR
run: |
set -euo pipefail
for tag in "${RELEASE_TAG}" "latest" "${RELEASE_TAG}-distroless" "distroless"; do
echo "Mirroring pgsty/silo:${tag} -> ghcr.io/${GITHUB_REPOSITORY,,}:${tag}"
docker buildx imagetools create \
--tag "ghcr.io/${GITHUB_REPOSITORY,,}:${tag}" \
"pgsty/silo:${tag}"
done
# The mirrored manifests must resolve to the same digests that were
# just verified on Docker Hub; anything else means the mirror lane
# silently diverged.
for pair in \
"${SILO_IMAGE_DIGEST} ${RELEASE_TAG}" \
"${SILO_IMAGE_DIGEST} latest" \
"${SILO_DISTROLESS_DIGEST} ${RELEASE_TAG}-distroless" \
"${SILO_DISTROLESS_DIGEST} distroless"; do
set -- ${pair}
want_digest="${1}"
tag="${2}"
got_digest="$(docker buildx imagetools inspect "ghcr.io/${GITHUB_REPOSITORY,,}:${tag}" --format '{{json .Manifest.Digest}}' | tr -d '"')"
if [ "${got_digest}" != "${want_digest}" ]; then
echo "ghcr.io ${tag} resolved to ${got_digest}, want ${want_digest}" >&2
exit 1
fi
done

- name: Generate architecture image SBOMs
env:
AMD64_DIGEST: ${{ steps.build-amd64.outputs.digest }}
Expand Down