build.yaml

name: build-custom-silverblue
on:
  pull_request:
  merge_group:
  schedule:
    - cron: '5 3 * * *'  # 3am-ish UTC everyday (timed against official fedora container pushes)
  workflow_dispatch:

jobs:
  build_custom_silverblue:
    name: main
    runs-on: ubuntu-24.04
    permissions:
      contents: read
      packages: write
      id-token: write
    strategy:
      fail-fast: false

    steps:
      # Checkout push-to-registry action GitHub repository
      - name: Checkout Push to Registry action
        uses: actions/checkout@v4
      
      # https://github.com/marketplace/actions/cosign-installer
      - name: Install cosign
        if: github.event_name != 'pull_request'
        uses: sigstore/cosign-installer@v3.6.0
        with:
          cosign-release: 'v2.4.0'

      # Build image using Buildah action
      - name: Build Image
        id: build_image
        uses: redhat-actions/buildah-build@v2
        with:
          containerfiles: |
            ./Containerfile
          image: ghcr.io/samhclark/custom-silverblue
          tags: |
            ${{ github.sha }}
            40
          oci: false

      - name: Push To GHCR
        uses: redhat-actions/push-to-registry@v2
        id: push
        if: github.event_name != 'pull_request'
        with:
          image: ${{ steps.build_image.outputs.image }}
          tags: ${{ steps.build_image.outputs.tags }}
          registry: ghcr.io/${{ github.repository_owner }}
          username: ${{ github.actor }}
          password: ${{ github.token }}
          extra-args: |
            --disable-content-trust

      # - name: Login to GitHub Container Registry
      #   uses: docker/login-action@v3
      #   if: github.event_name != 'pull_request'
      #   with:
      #     registry: ghcr.io
      #     username: ${{ github.actor }}
      #     password: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Sign the published OCI 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
          IMAGE: ${{ steps.build_image.outputs.image }}
          TAGS: ${{ steps.build_image.outputs.tags }}
          DIGEST: ${{ steps.push.outputs.digest }}
        # This step uses the identity token to provision an ephemeral certificate
        # against the sigstore community Fulcio instance.
        run: echo "${TAGS}" | xargs -I {} cosign sign --yes ${IMAGE}:{}@${DIGEST}

      - name: Echo outputs
        if: github.event_name != 'pull_request'
        run: |
          echo "${{ toJSON(steps.push.outputs) }}"