Skip to content

fix: update image signing process in CI to use digest instead of tags #6

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
captnbp merged 1 commit into from
Nov 3, 2026
Merged

fix: update image signing process in CI to use digest instead of tags #6

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
22 changes: 12 additions & 10 deletions .github/workflows/ci.yml
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -226,7 +226,6 @@ jobs:
type=ref,event=branch
type=ref,event=pr
type=semver,pattern={{version}}
type=semver,pattern={{major}}.{{minor}}
type=sha,prefix=sha-

# Build a single-arch image for the CVE scan: the image is scanned
Expand Down Expand Up @@ -269,6 +268,7 @@ jobs:
path: sbom.cyclonedx.json

- name: Build and push
id: build
uses: docker/build-push-action@v7
with:
context: .
Expand All @@ -283,14 +283,17 @@ jobs:
if: github.event_name != 'pull_request'
uses: sigstore/cosign-installer@v4.1.0

- name: Sign images with cosign
# Sign the image once per digest: every tag of this build points at
# the same manifest and the signature is stored against the digest, so
# signing each tag separately only duplicates the work - and the
# attestations collide in Rekor with 409 createLogEntryConflict.
- name: Sign image with cosign
if: github.event_name != 'pull_request'
env:
TAGS: ${{ steps.meta.outputs.tags }}
DIGEST: ${{ steps.build.outputs.digest }}
run: |
echo "$TAGS" | while read -r image; do
cosign sign --yes "$image"
done
image="${REGISTRY}/${IMAGE_NAME,,}@${DIGEST}"
cosign sign --yes "$image"

# Attach the SBOM to the pushed image as a cosign attestation, so the
# SBOM travels with the image in the registry (verifiable with
Expand All @@ -299,8 +302,7 @@ jobs:
- name: Attach SBOM to the image (cosign attest)
if: github.event_name != 'pull_request'
env:
TAGS: ${{ steps.meta.outputs.tags }}
DIGEST: ${{ steps.build.outputs.digest }}
run: |
echo "$TAGS" | while read -r image; do
cosign attest --yes --type cyclonedx --predicate sbom.cyclonedx.json "$image"
done
image="${REGISTRY}/${IMAGE_NAME,,}@${DIGEST}"
cosign attest --yes --type cyclonedx --predicate sbom.cyclonedx.json "$image"
Loading