docs: explain details and limit to post requests #11
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| name: Docker push | |
| # This workflow uses actions that are not certified by GitHub. | |
| # They are provided by a third-party and are governed by | |
| # separate terms of service, privacy policy, and support | |
| # documentation. | |
| on: | |
| push: | |
| branches: ["main"] | |
| # Publish semver tags as releases. | |
| tags: ["v*.*.*"] | |
| pull_request: | |
| branches: ["main"] | |
| env: | |
| # Use docker.io for Docker Hub if empty | |
| REGISTRY: ghcr.io | |
| # github.repository as <account>/<repo> | |
| IMAGE_NAME: ${{ github.repository }} | |
| jobs: | |
| build: | |
| runs-on: ubuntu-latest | |
| permissions: | |
| contents: read | |
| packages: write | |
| # This is used to complete the identity challenge | |
| # with sigstore/fulcio when running outside of PRs. | |
| id-token: write | |
| steps: | |
| - name: Checkout repository | |
| uses: actions/checkout@v3 | |
| # Install the cosign tool except on PR | |
| # https://github.com/sigstore/cosign-installer | |
| - name: Install cosign | |
| if: github.event_name != 'pull_request' | |
| uses: sigstore/cosign-installer@6e04d228eb30da1757ee4e1dd75a0ec73a653e06 #v3.1.1 | |
| with: | |
| cosign-release: "v2.1.1" | |
| # Set up BuildKit Docker container builder to be able to build | |
| # multi-platform images and export cache | |
| # https://github.com/docker/setup-buildx-action | |
| - name: Set up Docker Buildx | |
| uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0 | |
| # Login against a Docker registry except on PR | |
| # https://github.com/docker/login-action | |
| - name: Log into registry ${{ env.REGISTRY }} | |
| if: github.event_name != 'pull_request' | |
| uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0 | |
| with: | |
| registry: ${{ env.REGISTRY }} | |
| username: ${{ github.actor }} | |
| password: ${{ secrets.GITHUB_TOKEN }} | |
| # Extract metadata (tags, labels) for Docker | |
| # https://github.com/docker/metadata-action | |
| - name: Extract Docker metadata | |
| id: meta | |
| uses: docker/metadata-action@96383f45573cb7f253c731d3b3ab81c87ef81934 # v5.0.0 | |
| with: | |
| images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }} | |
| tags: | | |
| # set latest tag for default branch | |
| type=raw,value=latest,enable={{is_default_branch}} | |
| # Build and push Docker image with Buildx (don't push on PR) | |
| # https://github.com/docker/build-push-action | |
| - name: Build and push Docker image | |
| id: build-and-push | |
| uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0 | |
| with: | |
| context: . | |
| push: ${{ github.event_name != 'pull_request' }} | |
| tags: ${{ steps.meta.outputs.tags }} | |
| labels: ${{ steps.meta.outputs.labels }} | |
| cache-from: type=gha | |
| cache-to: type=gha,mode=max | |
| # Sign the resulting Docker image digest except on PRs. | |
| # This will only write to the public Rekor transparency log when the Docker | |
| # repository is public to avoid leaking data. If you would like to publish | |
| # transparency data even for private images, pass --force to cosign below. | |
| # https://github.com/sigstore/cosign | |
| - name: Sign the published Docker image | |
| if: ${{ github.event_name != 'pull_request' }} | |
| env: | |
| # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable | |
| TAGS: ${{ steps.meta.outputs.tags }} | |
| DIGEST: ${{ steps.build-and-push.outputs.digest }} | |
| # This step uses the identity token to provision an ephemeral certificate | |
| # against the sigstore community Fulcio instance. | |
| run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST} |