Sign Image #4
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| name: Sign Image | |
| # A workflow to sign an image on demand | |
| on: | |
| workflow_dispatch: | |
| inputs: | |
| image: | |
| description: 'Image to sign, including the tag' | |
| required: true | |
| jobs: | |
| sign: | |
| runs-on: ubuntu-latest | |
| permissions: | |
| contents: read | |
| packages: write | |
| steps: | |
| - name: Checkout code | |
| uses: actions/checkout@v4 | |
| - name: Login to GHCR | |
| uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v3 | |
| with: | |
| registry: ghcr.io | |
| username: ${{ github.actor }} | |
| password: ${{ secrets.GITHUB_TOKEN }} | |
| - name: Get digest | |
| id: get-digest | |
| env: | |
| IMAGE_TO_SIGN: ${{ inputs.image }} | |
| run: | | |
| digest=$(skopeo inspect docker://$IMAGE_TO_SIGN --format '{{.Digest}}') | |
| name=$(skopeo inspect docker://$IMAGE_TO_SIGN --format '{{.Name}}') | |
| echo "DIGEST=$digest" >> $GITHUB_OUTPUT | |
| echo "NAME=$name" >> $GITHUB_OUTPUT | |
| - name: Setup Cosign | |
| uses: sigstore/cosign-installer@59acb6260d9c0ba8f4a2f9d9b48431a222b68e20 # v3.5.0 | |
| - name: Sign Image | |
| env: | |
| SIGNING_KEY: ${{ secrets.SIGNING_SECRET }} | |
| IMAGE_NAME: ${{ steps.get-digest.outputs.NAME }} | |
| IMAGE_DIGEST: ${{ steps.get-digest.outputs.DIGEST }} | |
| run: | | |
| cosign sign -y --key env://SIGNING_KEY $IMAGE_NAME@$IMAGE_DIGEST |