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ci: migrate cosign to v3 and dual-publish image signatures #3382

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SamMorrowDrums merged 3 commits into from
Oct 2, 2026
+11 −7
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ci: migrate cosign to v3 and dual-publish image signatures #3382

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9149ed1
ci: migrate cosign to v3 with legacy signature compatibility
SamMorrowDrums Oct 2, 2026
813e3fa
ci: dual-publish legacy and native cosign image signatures
SamMorrowDrums Oct 2, 2026
21f4377
Merge branch 'main' into sammorrowdrums-cosign-v3-signing-migration
SamMorrowDrums Oct 2, 2026
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18 changes: 11 additions & 7 deletions .github/workflows/docker-publish.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,7 @@ jobs:
if: github.event_name != 'pull_request'
uses: sigstore/cosign-installer@6f9f17788090df1f26f669e9d70d6ae9567deba6 #v4.1.2
with:
cosign-release: "v2.6.5"
cosign-release: "v3.1.3"

# Set up BuildKit Docker container builder to be able to build
# multi-platform images and export cache
Expand Down Expand Up @@ -122,16 +122,20 @@ jobs:
oauth_client_secret=${{ secrets.OAUTH_CLIENT_SECRET }}

# Sign the resulting Docker image digest except on PRs.
# This will only write to the public Rekor transparency log when the Docker
# repository is public to avoid leaking data. If you would like to publish
# transparency data even for private images, pass --force to cosign below.
# Publish both v2-compatible .sig tags and native Sigstore bundles.
# --yes also consents to publishing signing metadata to the public log.
# https://github.com/sigstore/cosign
- name: Sign the published Docker image
- name: Sign the published Docker image (legacy)
if: ${{ github.event_name != 'pull_request' }}
env:
# https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
TAGS: ${{ steps.meta.outputs.tags }}
DIGEST: ${{ steps.build-and-push.outputs.digest }}
# This step uses the identity token to provision an ephemeral certificate
# against the sigstore community Fulcio instance.
run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}
run: cosign sign --yes --new-bundle-format=false --use-signing-config=false --registry-referrers-mode=legacy "${REGISTRY}/${IMAGE_NAME}@${DIGEST}"

- name: Sign the published Docker image (native bundle)
if: ${{ github.event_name != 'pull_request' }}
env:
DIGEST: ${{ steps.build-and-push.outputs.digest }}
run: cosign sign --yes "${REGISTRY}/${IMAGE_NAME}@${DIGEST}"
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