build-docker.yml

name: Build docker image

on:
  push:
    branches: ["main", "*"]
  pull_request:
    # The branches below must be a subset of the branches above
    branches: ["main"]

jobs:
  prepare:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.finding-files.outputs.FILELIST }}
      branch: ${{ steps.extract_branch.outputs.branch }}
      repository: ${{ steps.extract_repo.outputs.repository }}
    steps:
      - uses: actions/checkout@v4
      - name: Finding files and store to output
        id: finding-files
        run: |
          echo "FILELIST=$(find . -name 'Containerfile' -print | jq -R -s -c 'split("\n")[:-1]')" >> $GITHUB_OUTPUT
      - name: Show files
        run: echo "${{ steps.finding-files.outputs.FILELIST }}"
      - name: Extract branch name
        shell: bash
        run: echo "branch=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}" >> $GITHUB_OUTPUT
        id: extract_branch
      - name: Extract repo name
        shell: bash
        run: echo "repository=${GITHUB_REPOSITORY@L}" >> $GITHUB_OUTPUT
        id: extract_repo
  build-image:
    runs-on: ubuntu-latest
    needs: prepare
    strategy:
      matrix:
        manifest: ${{ fromJson(needs.prepare.outputs.matrix) }}
    steps:
      - uses: actions/checkout@v4
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      - name: Setup Go environment
        uses: actions/setup-go@v5.1.0
      - name: Run prepare
        run: |
          cd src-template
          go run main.go
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Extract folder name
        shell: bash
        run: read -ra strarr <<<"${{ matrix.manifest }}" && echo "folder=$($strarr[1])" >> $GITHUB_OUTPUT
        env:
          IFS: "/"
        id: extract_folder
      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: |
            ghcr.io/${{ needs.prepare.outputs.repository }}/${{steps.extract_folder.outputs.folder}}:${{ needs.prepare.outputs.branch }}