Add container signing workflow #2
Workflow file for this run
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| name: Sign container image | |
| on: | |
| workflow_run: | |
| workflows: ["Build and push images"] | |
| types: | |
| - completed | |
| workflow_dispatch: | |
| push: | |
| jobs: | |
| sign: | |
| name: Create attestation | |
| runs-on: ubuntu-22.04 | |
| strategy: | |
| matrix: | |
| version: ['3.2'] | |
| permissions: | |
| packages: write | |
| steps: | |
| - name: Login to GHCR | |
| uses: docker/[email protected] | |
| with: | |
| registry: ghcr.io | |
| username: ${{ github.actor }} | |
| password: ${{ secrets.GITHUB_TOKEN }} | |
| - uses: sigstore/[email protected] | |
| - uses: anchore/sbom-action/download-syft@v0 | |
| id: syft | |
| - name: Create attestation | |
| run: | | |
| BASE_IMAGE='ghcr.io/alphagov/govuk-ruby-base:${{ 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 --predicate base.spdx.json --key "awskms:///alias/container-signing-key" "${BASE_IMAGE}" | |
| cosign attest --predicate builder.spdx.json --key "awskms:///alias/container-signing-key" "${BUILDER_IMAGE}" |