name: Build Primary Docker Image

on:
  workflow_dispatch:
    inputs:
      version:
        description: 'Semantic version to label the Docker image under (no "v" prefix, e.g. "1.2.3")'
        required: true
        type: string
      tag_latest:
        description: 'Also tag this image as :latest? (Keep false for RC and beta releases)'
        required: false
        type: boolean
        default: false

jobs:
  check_authorization:
    name: Check authorization to publish new Docker image
    runs-on: ubuntu-latest
    outputs:
      isAuthorized: ${{ steps.check-auth.outputs.is_authorized }}
    steps:
      - name: check-auth
        id: check-auth
        run: echo "is_authorized=${{ contains(secrets.DEPLOYMENT_AUTHORIZED_USERS, github.triggering_actor) }}" >> $GITHUB_OUTPUT

  build:
    name: Build primary image (${{ matrix.platform }})
    needs: check_authorization
    if: needs.check_authorization.outputs.isAuthorized == 'true'
    runs-on: ${{ matrix.runner }}
    permissions:
      contents: read
      packages: write
    strategy:
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
          - platform: linux/arm64
            runner: ubuntu-latest-arm64
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          platforms: ${{ matrix.platform }}
          outputs: type=image,name=ghcr.io/${{ github.repository_owner }}/project-nomad,push-by-digest=true,name-canonical=true,push=true
          build-args: |
            VERSION=${{ inputs.version }}
            BUILD_DATE=${{ github.event.workflow_run.created_at }}
            VCS_REF=${{ github.sha }}
      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"
      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ matrix.platform == 'linux/amd64' && 'amd64' || 'arm64' }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    name: Create and push multi-arch manifest
    needs: build
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create \
            -t ghcr.io/${{ github.repository_owner }}/project-nomad:${{ inputs.version }} \
            -t ghcr.io/${{ github.repository_owner }}/project-nomad:v${{ inputs.version }} \
            ${{ inputs.tag_latest && '-t ghcr.io/${{ github.repository_owner }}/project-nomad:latest' || '' }} \
            $(printf 'ghcr.io/${{ github.repository_owner }}/project-nomad@sha256:%s ' *)
      - name: Inspect image
        run: |
          docker buildx imagetools inspect ghcr.io/${{ github.repository_owner }}/project-nomad:${{ inputs.version }}