build.yaml

name: Build image

# 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:
      - master

env:
  # Use docker.io for Docker Hub if empty
  REGISTRY: ${{ vars.FUGA_REGISTRY_FQDN }}
  # github.repository as <account>/<repo>
  IMAGE: public/actions-runner

jobs:
  build:
    runs-on: actions-runners-machete
    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@v4

      # Extract the version from the Dockerfile
      - name: Set version from Dockerfile
        id: set-version
        run: |
          VERSION=$(grep -oP '^FROM ghcr.io/actions/actions-runner:\K[^\s]+' Dockerfile)
          echo "VERSION=$VERSION" >> $GITHUB_ENV

      # Install the cosign tool except on PR
      # https://github.com/sigstore/cosign-installer
      - name: Install cosign
        uses: sigstore/cosign-installer@59acb6260d9c0ba8f4a2f9d9b48431a222b68e20 #v3.5.0
        with:
          cosign-release: 'v2.2.4'

      # 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 }}
        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.FUGA_REGISTRY_USERNAME }}
          password: ${{ secrets.FUGA_REGISTRY_PASSWORD }}

      # 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: true
          tags: ${{ env.REGISTRY }}/${{ env.IMAGE }}:${{ env.VERSION }},${{ env.REGISTRY }}/${{ env.IMAGE }}:latest
          cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE }}:buildcache
          cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE }}:buildcache,mode=max,ignore-error=true

      # 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
        env:
          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
          TAGS: |-
            ${{ env.REGISTRY }}/${{ env.IMAGE }}:${{ env.VERSION }}
            ${{ env.REGISTRY }}/${{ env.IMAGE }}:latest
          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}