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Feat: Add attestations to published images #8

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add attestations to images
sgress454 Dec 2, 2025
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sgress454 Dec 2, 2025
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110 changes: 109 additions & 1 deletion .github/workflows/build-minio.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ on:
env:
GITHUB_REGISTRY: ghcr.io
DOCKER_REGISTRY: docker.io
IMAGE_NAME: coollabsio/minio
IMAGE_NAME: ${{ secrets.IMAGE_NAME_OVERRIDE || 'coollabsio/minio' }}

jobs:
check-release:
Expand Down Expand Up @@ -185,3 +185,111 @@ jobs:
echo "- GHCR: ${{ env.GITHUB_REGISTRY }}/${{ env.IMAGE_NAME }}:${{ needs.check-release.outputs.version }}" >> $GITHUB_STEP_SUMMARY
echo "- Docker Hub: ${{ env.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:${{ needs.check-release.outputs.version }}" >> $GITHUB_STEP_SUMMARY
echo "- Latest: ${{ env.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:latest" >> $GITHUB_STEP_SUMMARY

collect-digests:
needs:
- merge-manifest
- check-release
runs-on: ubuntu-latest
outputs:
collect-ghcr-digests: ${{ steps.collect-ghcr-digests.outputs.digests_json }}
collect-dockerhub-digests: ${{ steps.collect-dockerhub-digests.outputs.digests_json }}
steps:
- name: Collect Docker Hub image digests
id: collect-dockerhub-digests
run: |
IMAGE="${{ env.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:${{ needs.check-release.outputs.version }}"

# Pull raw OCI index
RAW=$(docker buildx imagetools inspect --raw "$IMAGE")

# Get real image digests. If this is a re-run, we may have attestations present,
# so filter those out.
DIGESTS=$(echo "$RAW" | jq -r '
.manifests[]
| select(.platform.architecture != null) # keep manifests with a real platform
| select(.annotations["vnd.docker.reference.type"] != "attestation-manifest") # skip attestations
| .digest
')

JSON=$(printf '%s\n' "$DIGESTS" | jq -R . | jq -s .)

# Convert newline-separated list to JSON array for workflow matrix
{
echo "digests_json<<EOF"
echo "$JSON"
echo "EOF"
} >> "$GITHUB_OUTPUT"
- name: Collect GHCR image digests
id: collect-ghcr-digests
run: |
IMAGE="${{ env.GITHUB_REGISTRY }}/${{ env.IMAGE_NAME }}:${{ needs.check-release.outputs.version }}"

# Pull raw OCI index
RAW=$(docker buildx imagetools inspect --raw "$IMAGE")

# Get real image digests. If this is a re-run, we may have attestations present,
# so filter those out.
DIGESTS=$(echo "$RAW" | jq -r '
.manifests[]
| select(.platform.architecture != null) # keep manifests with a real platform
| select(.annotations["vnd.docker.reference.type"] != "attestation-manifest") # skip attestations
| .digest
')

JSON=$(printf '%s\n' "$DIGESTS" | jq -R . | jq -s .)

# Convert newline-separated list to JSON array for workflow matrix
{
echo "digests_json<<EOF"
echo "$JSON"
echo "EOF"
} >> "$GITHUB_OUTPUT"

attest-ghcr:
needs: collect-digests
runs-on: ubuntu-latest
permissions:
id-token: write
packages: write
attestations: write
strategy:
matrix:
digest: ${{ fromJson(needs.collect-digests.outputs.collect-ghcr-digests) }}
steps:
- name: Login to ${{ env.GITHUB_REGISTRY }}
uses: docker/login-action@v3
with:
registry: ${{ env.GITHUB_REGISTRY }}
username: ${{ github.actor }}
password: ${{ secrets.GITHUB_TOKEN }}
- name: Attest provenance (GHCR)
uses: actions/attest-build-provenance@v1
with:
subject-name: ${{ env.GITHUB_REGISTRY }}/${{ env.IMAGE_NAME }}
subject-digest: ${{ matrix.digest }}
push-to-registry: true

attest-dockerhub:
needs: collect-digests
runs-on: ubuntu-latest
permissions:
id-token: write
packages: write
attestations: write
strategy:
matrix:
digest: ${{ fromJson(needs.collect-digests.outputs.collect-dockerhub-digests) }}
steps:
- name: Login to ${{ env.DOCKER_REGISTRY }}
uses: docker/login-action@v3
with:
registry: ${{ env.DOCKER_REGISTRY }}
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
- name: Attest provenance (Docker Hub)
uses: actions/attest-build-provenance@v1
with:
subject-name: ${{ env.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}
subject-digest: ${{ matrix.digest }}
push-to-registry: true