name: Docker

on:
  push:
    branches:
      - master

env:
  VERSION: latest

jobs:
  push:
    name: Push
    runs-on: ubuntu-latest
    if: github.event_name == 'push'

    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 Alpine Image
        run: docker build ./alpine --file Dockerfile --tag alpine

      - name: Build Java8 Image
        run: docker build ./java8 --file Dockerfile --tag java8

      - name: Push Alpine Image
        run: |
          IMAGE_NAME=alpine
          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

      - name: Push Java8 Image
        run: |
          IMAGE_NAME=java8
          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