name: Build Docker Image

on:
  push:
    tags:
      - '*'

jobs:
  build-and-push-image:
    name: Docker Build
    runs-on: self-hosted
    permissions:
      contents: read
      packages: write

    steps:
    - name: Set version
      id: version
      run: echo "::set-output name=version::$(echo ${GITHUB_REF#refs/tags/})"

    - name: Check out the repo
      uses: actions/checkout@v4

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

    - name: Cache Docker layers
      uses: actions/cache@v3
      with:
        path: /tmp/.buildx-cache
        key: ${{ runner.os }}-buildx-${{ github.sha }}
        restore-keys: |
          ${{ runner.os }}-buildx-

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

    - name: Extract metadata (tags, labels) for Docker
      id: meta
      uses: docker/metadata-action@v5
      with:
        images: ghcr.io/${{ github.repository }}

    - name: Generate build variables
      id: prep
      run: |
        echo "built_at=$(date +%Y-%m-%dT%H:%M:%S)" >> $GITHUB_OUTPUT
        echo "go_version=$(go version | cut -d ' ' -f 3)" >> $GITHUB_OUTPUT
        echo "git_commit=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT

    - name: Build and push Docker image
      uses: docker/build-push-action@v5
      with:
        context: .
        platforms: linux/amd64,linux/arm64
        push: true
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}
        cache-from: type=local,src=/tmp/.buildx-cache
        cache-to: type=local,dest=/tmp/.buildx-cache
        build-args: |
          BuiltAt=${{ steps.prep.outputs.built_at }}
          GoVersion=${{ steps.prep.outputs.go_version }}
          GitCommit=${{ steps.prep.outputs.git_commit }}
          Version=${{ steps.version.outputs.version }}

    - name: Extract metadata (tags, labels) for Docker
      if: startsWith(github.ref, 'refs/tags/v')
      id: publicmeta
      uses: docker/metadata-action@v5
      with:
        images: ghcr.io/${{ github.repository }}-testing

    - name: Build and push Docker image
      if: startsWith(github.ref, 'refs/tags/v')
      uses: docker/build-push-action@v5
      with:
        context: .
        platforms: linux/amd64,linux/arm64
        push: true
        tags: ${{ steps.publicmeta.outputs.tags }}
        labels: ${{ steps.publicmeta.outputs.labels }}
        cache-from: type=local,src=/tmp/.buildx-cache
        cache-to: type=local,dest=/tmp/.buildx-cache
        build-args: |
          BuiltAt=$(date +%Y-%m-%dT%H:%M:%S)
          GoVersion=$(go version)
          GitCommit=$(git rev-parse HEAD)
          Version=${{ steps.version.outputs.version }}