build_release.yml

name: Build on ubuntu and maybe release

on:
  push:
  pull_request:
  
jobs:
  build:
    env:
      RELEASE_OS: ubuntu-24.04
      RELEASE_GOVER: "1.22"

    strategy:
      fail-fast: false
      matrix:
        os: [ ubuntu-24.04, ubuntu-22.04, ubuntu-20.04 ]
        gover: [ "1.22", "1.21", 1.20" ]

    runs-on: ${{ matrix.os }}

    steps:
      - uses: actions/setup-go@v4.0.1
        with:
          go-version: ${{ matrix.gover }}
      - uses: actions/checkout@v4
      - name: Build the project
        run: go build .
      - name: Save built binary
        if: startsWith(github.ref, 'refs/tags/') && ${{ matrix.os }} == ${{ env.RELEASE_OS }} && ${{ matrix.gover }} == ${{ env.RELEASE_GOVER }}
        uses: actions/upload-artifact@v4
        with:
          name: docker-on-top
          path: ./docker-on-top
          if-no-files-found: error
          retention-days: 1
        
  release:
    needs: build
    if: startsWith(github.ref, 'refs/tags/')

    runs-on: ubuntu-latest
  
    steps:
      - uses: actions/checkout@v4
      - name: Prepare release notes
        run: |
          # Assert that the changelog begins with this release
          head -1 CHANGELOG.md | grep -E "^# ${{ github.ref_name }}$"
          # Extract the part of changelog for this release (until next first-level heading)
          tail -n +2 CHANGELOG.md | sed '/^# /q' | head -n-1 > this-changelog.md
      - name: Restore built binary
        uses: actions/download-artifact@v4
        with:
          name: docker-on-top
          path: ./docker-on-top
      - name: Release new version
        uses: softprops/action-gh-release@v2
        with:
          body_path: ${{ github.workspace }}/this-changelog.md
          files: |
            ./docker-on-top
            ./docker-on-top.service