build.yml

name: build-bluecat
on:
  pull_request:
    branches:
      - main
  schedule:
    - cron: '05 10 * * *'  # 10:05am UTC everyday
  push:
    branches:
      - main
    paths-ignore:
      - '**/README.md'
  workflow_dispatch:

env:
  MY_IMAGE_NAME: "${{ github.event.repository.name }}"  # the name of the image produced by this build, matches repo names
  MY_IMAGE_DESC: "My Customized Universal Blue Image"
  IMAGE_REGISTRY: "ghcr.io/${{ github.repository_owner }}"  # do not edit

concurrency:
  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}-${{ inputs.brand_name}}-${{ inputs.stream_name }}
  cancel-in-progress: true

jobs:
  build_push:
    name: Build and push image
    runs-on: ubuntu-24.04
    strategy:
      matrix:
        variant: [amd-intel, nvidia]  # Define the two variants
    env:
      VARIANT: ${{ matrix.variant }}
      CONTAINERFILE: ${{ matrix.variant == 'amd' && './Containerfile' || './Containerfile-Nvidia' }}
      IMAGE_NAME_SUFFIX: ${{ matrix.variant == 'nvidia' && '-nvidia' || '' }}

    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      - name: Checkout Push to Registry action
        uses: actions/checkout@v4

      - name: Maximize build space
        uses: ublue-os/remove-unwanted-software@v7

      - name: Generate tags
        id: generate-tags
        shell: bash
        run: |
          # Generate a timestamp for creating an image version history
          TIMESTAMP="$(date +%Y%m%d)"
          COMMIT_TAGS=()
          BUILD_TAGS=()

          # Have tags for tracking builds during pull request
          SHA_SHORT="${GITHUB_SHA::7}"
          COMMIT_TAGS+=("pr-${{ github.event.number }}")
          COMMIT_TAGS+=("${SHA_SHORT}")

          # Append matching timestamp tags to keep a version history
          for TAG in "${BUILD_TAGS[@]}"; do
              BUILD_TAGS+=("${TAG}-${TIMESTAMP}")
          done

          BUILD_TAGS+=("${TIMESTAMP}")
          BUILD_TAGS+=("latest")

          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
              alias_tags=("${COMMIT_TAGS[@]}")
          else
              alias_tags=("${BUILD_TAGS[@]}")
          fi

          echo "alias_tags=${alias_tags[*]}" >> $GITHUB_OUTPUT

      - name: Image Metadata
        uses: docker/metadata-action@v5
        id: meta
        with:
          images: |
            ${{ env.MY_IMAGE_NAME }}${{ env.IMAGE_NAME_SUFFIX }}
          labels: |
            org.opencontainers.image.description=${{ env.MY_IMAGE_DESC }}
            org.opencontainers.image.title=${{ env.MY_IMAGE_NAME }}${{ env.IMAGE_NAME_SUFFIX }}

      - name: Build Image
        id: build_image
        uses: redhat-actions/buildah-build@v2
        with:
          containerfiles: |
            ${{ env.CONTAINERFILE }}
          image: ${{ env.MY_IMAGE_NAME }}${{ env.IMAGE_NAME_SUFFIX }}
          tags: |
            ${{ steps.generate-tags.outputs.alias_tags }}
          labels: ${{ steps.meta.outputs.labels }}

      - name: Lowercase Registry
        id: registry_case
        uses: ASzc/change-string-case-action@v6
        with:
          string: ${{ env.IMAGE_REGISTRY }}

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Push Image to GHCR
        uses: redhat-actions/push-to-registry@v2
        id: push
        env:
          REGISTRY_USER: ${{ github.actor }}
          REGISTRY_PASSWORD: ${{ github.token }}
        with:
          image: ${{ steps.build_image.outputs.image }}
          tags: ${{ steps.build_image.outputs.tags }}
          registry: ${{ steps.registry_case.outputs.lowercase }}


      # Sign container
      - uses: sigstore/cosign-installer@v3.7.0
        if: github.event_name != 'pull_request'

      - name: Sign container image
        if: github.event_name != 'pull_request'
        run: |
          cosign sign -y --key env://COSIGN_PRIVATE_KEY ${{ steps.registry_case.outputs.lowercase }}/${{ steps.build_image.outputs.image }}@${TAGS}
        env:
          TAGS: ${{ steps.push.outputs.digest }}
          COSIGN_EXPERIMENTAL: false
          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}