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Nicolò Boschi 59ffb1d4a3 ci: add manual workflow to cosign-sign published GHCR images (#1495)
Standalone workflow_dispatch path that resolves a published tag to its
manifest digest, signs it with keyless OIDC via cosign, and verifies the
signature in the same job. Decoupled from release.yml so we can backfill
v0.6.0 (and prior) without coupling supply-chain signing to the release
cut. Once proven, the same sign step will fold into release.yml.

Refs #1484
2026-05-07 11:37:21 +02:00

72 lines
2.2 KiB
YAML

name: Sign published images
on:
workflow_dispatch:
inputs:
version:
description: 'Version to sign (without leading v, e.g. 0.6.0)'
required: true
type: string
default: '0.6.0'
permissions:
contents: read
packages: write
id-token: write
jobs:
sign:
name: Sign ${{ matrix.image }}:${{ inputs.version }}${{ matrix.suffix }}
runs-on: ubuntu-latest
strategy:
fail-fast: false
matrix:
include:
- { image: hindsight-api, suffix: '' }
- { image: hindsight-api, suffix: '-slim' }
- { image: hindsight-control-plane, suffix: '' }
- { image: hindsight, suffix: '' }
- { image: hindsight, suffix: '-slim' }
steps:
- name: Set up Docker Buildx
uses: docker/setup-buildx-action@v4
- name: Log in to GHCR
uses: docker/login-action@v4
with:
registry: ghcr.io
username: ${{ github.actor }}
password: ${{ secrets.GITHUB_TOKEN }}
- name: Install cosign
uses: sigstore/cosign-installer@v3
- name: Resolve image digest
id: resolve
env:
IMAGE: ghcr.io/${{ github.repository_owner }}/${{ matrix.image }}
TAG: ${{ inputs.version }}${{ matrix.suffix }}
run: |
set -euo pipefail
DIGEST=$(docker buildx imagetools inspect "${IMAGE}:${TAG}" --format '{{json .Manifest.Digest}}' | tr -d '"')
if [[ -z "${DIGEST}" || "${DIGEST}" != sha256:* ]]; then
echo "Failed to resolve digest for ${IMAGE}:${TAG} (got: ${DIGEST})" >&2
exit 1
fi
echo "Resolved ${IMAGE}:${TAG} -> ${DIGEST}"
echo "ref=${IMAGE}@${DIGEST}" >> "$GITHUB_OUTPUT"
- name: Sign image
env:
REF: ${{ steps.resolve.outputs.ref }}
run: cosign sign --yes "${REF}"
- name: Verify signature
env:
REF: ${{ steps.resolve.outputs.ref }}
run: |
cosign verify "${REF}" \
--certificate-identity-regexp "^https://github\.com/${{ github.repository }}/\.github/workflows/sign-images\.yml@.*" \
--certificate-oidc-issuer https://token.actions.githubusercontent.com