Sign container images #357
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| name: Sign container images | |
| on: | |
| workflow_run: | |
| workflows: ["Build and push multi-arch images"] | |
| types: | |
| - completed | |
| workflow_dispatch: | |
| jobs: | |
| sign: | |
| name: Create attestation | |
| runs-on: ubuntu-latest | |
| strategy: | |
| matrix: | |
| version: ['3.2', '3.3'] | |
| permissions: | |
| packages: write | |
| id-token: write | |
| steps: | |
| - name: Login to GHCR | |
| uses: docker/login-action@v3 | |
| with: | |
| registry: ghcr.io | |
| username: ${{ github.actor }} | |
| password: ${{ secrets.GITHUB_TOKEN }} | |
| - uses: sigstore/cosign-installer@v3.4.0 | |
| - uses: anchore/sbom-action/download-syft@b6a39da80722a2cb0ef5d197531764a89b5d48c3 # v0.15.8 | |
| id: syft | |
| - name: Configure AWS credentials | |
| uses: aws-actions/configure-aws-credentials@v4 | |
| with: | |
| role-to-assume: "arn:aws:iam::172025368201:role/github_action_image_attestation" | |
| role-session-name: sign-govuk-ruby-images | |
| aws-region: eu-west-1 | |
| - name: Create attestation | |
| run: | | |
| BASE_IMAGE='ghcr.io/alphagov/govuk-ruby-base:${{ matrix.version }}' | |
| BUILDER_IMAGE='ghcr.io/alphagov/govuk-ruby-builder:${{ matrix.version }}' | |
| SYFT='${{steps.syft.outputs.cmd }}' | |
| $SYFT --output spdx-json "${BASE_IMAGE}" > base.spdx.json | |
| $SYFT --output spdx-json "${BUILDER_IMAGE}" > builder.spdx.json | |
| cosign attest -y --type spdxjson --predicate base.spdx.json --key "awskms:///alias/container-signing-key" "${BASE_IMAGE}" | |
| cosign attest -y --type spdxjson --predicate builder.spdx.json --key "awskms:///alias/container-signing-key" "${BUILDER_IMAGE}" |