Sign container images #381
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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: ${{ secrets.GITHUB_TOKEN }} | |
| - uses: sigstore/[email protected] | |
| - uses: anchore/sbom-action/download-syft@b6a39da80722a2cb0ef5d197531764a89b5d48c3 # v0.15.8 | |
| id: syft | |
| - name: Configure AWS credentials | |
| uses: aws-actions/configure-aws-credentials@v4 | |
| with: | |
| role-to-assume: "arn:aws:iam::172025368201:role/github_action_image_attestation" | |
| role-session-name: sign-govuk-ruby-images | |
| aws-region: eu-west-1 | |
| - name: Create attestation | |
| run: | | |
| BASE_IMAGE='ghcr.io/alphagov/govuk-ruby-base:${{ 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}" |