name: Docker

on:
  push:
    branches:
      - master

env:
  VERSION: latest

jobs:
  push:
    name: Push
    runs-on: ubuntu-latest

    strategy:
      matrix:
        image:
          - "alpine"
          - "java7"
          - "java8"
          - "java9"
          - "java10"
          - "java11"
          - "java12"
          - "java13"
          - "java14"
          - "source"

    steps:
      - name: Code Checkout
        uses: actions/checkout@v2

      - name: Registry Authentication
        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login docker.pkg.github.com -u ${{ github.actor }} --password-stdin

      - name: Build Image
        run: docker build ./${{ matrix.image }} --tag alpine

      - name: Push Image
        run: |
          IMAGE_NAME=${{ matrix.image }}
          IMAGE_ID=docker.pkg.github.com/${{ github.repository }}/$IMAGE_NAME
          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')

          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
          docker push $IMAGE_ID:$VERSION