name: Build
on:
  pull_request:
    branches:
      - main
    paths-ignore:
      - "**.md"
  merge_group:
  workflow_dispatch:

env:
  IMAGE_REGISTRY: ghcr.io/${{ github.repository_owner }}
  IMAGE_NAME: common

jobs:
  build_push:
    name: Build and push image
    runs-on: ubuntu-26.04
    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          submodules: recursive

      - name: Generate tags
        id: generate-tags
        shell: bash
        run: |
          echo "sha_short=${GITHUB_SHA::7}" >> $GITHUB_OUTPUT
          alias_tags=()
          # Only perform the follow code when the action is spawned from a Pull Request
          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
            alias_tags+=("pr-${{ github.event.number }}")
          else
            # The following is run when the timer is triggered or a merge/push to main
            echo "date=$(date +%Y%m%d)" >> $GITHUB_OUTPUT
            alias_tags+=("latest")
          fi
          echo "alias_tags=${alias_tags[*]}" >> $GITHUB_OUTPUT

      - name: Build Image
        id: build_image
        uses: redhat-actions/buildah-build@719e3c40d8af9790c23eca13f7daa339f2867034 # v3.1.0
        with:
          containerfiles: |
            ./Containerfile
          image: ${{ env.IMAGE_NAME }}
          tags: |
            ${{ steps.generate-tags.outputs.alias_tags }}
            ${{ steps.generate-tags.outputs.date }}
            ${{ steps.generate-tags.outputs.sha_short }}
          oci: true

      - name: Login to GitHub Container Registry
        uses: docker/login-action@8aa5831fb8d48d8f76594c7ddde61ae58019f550 # v4.8.0
        if: github.event_name != 'pull_request'
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Push the image to GHCR (Image Registry)
      - name: Push To GHCR
        uses: redhat-actions/push-to-registry@94ade333c38ecc0e60e94785125d9a52ca423b37 # v3.0.0
        id: push
        if: github.event_name != 'pull_request'
        env:
          REGISTRY_USER: ${{ github.actor }}
          REGISTRY_PASSWORD: ${{ github.token }}
        with:
          image: ${{ steps.build_image.outputs.image }}
          tags: ${{ steps.build_image.outputs.tags }}
          registry: ${{ env.IMAGE_REGISTRY }}
          username: ${{ env.REGISTRY_USER }}
          password: ${{ env.REGISTRY_PASSWORD }}
          extra-args: |
            --compression-format=zstd

      - name: Install Cosign
        uses: sigstore/cosign-installer@756fe2d284c7292c4e9b62c8a28f1e5629c59532 # v4.1.3
        if: github.event_name != 'pull_request'
        with:
          # be careful when upgrading major versions
          cosign-release: 'v3.1.4'

      - name: Sign container image
        if: github.event_name != 'pull_request'
        run: |
          # Sign with both OIDC and static key so we have compatibility with both
          # https://github.com/containers/container-libs/issues/388
          # https://github.com/coreos/rpm-ostree/issues/5509
          cosign sign -y ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}@${TAGS}

          # use old bundle format, so we can use newer cosign 3.X.X instead of 2.X.X
          cosign sign -y --new-bundle-format=false --use-signing-config=false --key env://COSIGN_PRIVATE_KEY ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}@${TAGS}
        env:
          TAGS: ${{ steps.push.outputs.digest }}
          COSIGN_EXPERIMENTAL: false
          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}