build-and-publish.yml

name: "Build & Publish"

on:
  push:
    branches:
      - main
  workflow_dispatch: ~

jobs:
  build:
    runs-on: ubuntu-latest
    name: "🧰 Build Docker Image"
    steps:
    - name: "🚦 Setup BuildX Environment"
      uses: docker/setup-buildx-action@v1

    - name: "🔐 Login to GitHub Container Registry"
      uses: docker/login-action@v1
      with:
        registry: ${{ secrets.REGISTRY_HOSTNAME }}
        username: ${{ secrets.REGISTRY_USERNAME }}
        password: ${{ secrets.REGISTRY_PASSWORD }}

    - name: "📩 Checkout Project"
      uses: actions/checkout@v2

    # https://github.com/docker/build-push-action/issues/37
    # not using ::set-env because ACTIONS_ALLOW_UNSECURE_COMMANDS = False
    - name: "⬇️ Lowercasing Target"
      run: |
        echo GHCR_PATH=$(echo "${REPOSITORY}" | tr '[:upper:]' '[:lower:]') >> ${GITHUB_ENV}
      env:
        REPOSITORY: ${{ github.repository }}

    - name: "🧰 Build Docker Image"
      uses: docker/build-push-action@v2
      with:
        context: .
        push: true
        tags: ${{ secrets.REGISTRY_HOSTNAME }}/${{ env.GHCR_PATH }}:latest