_docker.yaml

name: Docker

on:
  workflow_call:
    inputs:
      registry:
        description: Container registry
        type: string
        default: ghcr.io
      image_name:
        description: Image name
        type: string
        default: ${{ github.repository }}
    outputs:
      image_tag:
        description: The primary image tag built
        value: ${{ jobs.build.outputs.image_tag }}

jobs:
  build:
    name: Build
    runs-on: ubuntu-latest
    permissions:
      contents: read
    outputs:
      image_tag: ${{ steps.meta.outputs.version }}

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ inputs.registry }}/${{ inputs.image_name }}
          tags: |
            type=semver,pattern={{version}},enable=${{ github.event_name == 'release' }}
            type=semver,pattern={{major}}.{{minor}},enable=${{ github.event_name == 'release' }}
            type=sha,prefix=,enable=${{ github.event_name != 'release' }}

      - name: Build image
        uses: docker/build-push-action@v5
        with:
          context: .
          load: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Save image artifact
        run: |
          FIRST_TAG=$(echo "${{ steps.meta.outputs.tags }}" | head -1)
          docker save -o farm-image.tar "$FIRST_TAG"

      - name: Upload image artifact
        uses: actions/upload-artifact@v4
        with:
          name: docker-image
          path: farm-image.tar
          retention-days: 1