build-push-image.yml

name: Build and push docker images 

on:
  push:
    tags:
      - 'v[0-9]+.[0-9]+.[0-9]+'
    branches:
      - 'demo*'

  workflow_dispatch:

  workflow_call:
    inputs:
      ref_name:
        required: true
        type: string
        description: "ref to checkout and build images from"
    
jobs:
  build-and-push-image:
    strategy:
      fail-fast: true
      matrix:
        apps:
          - image_name: gateway
            build_context: ./apps/gateway
          - image_name: customers
            build_context: ./apps/customers
          - image_name: superheroes
            build_context: ./apps/superheroes
          - image_name: mysql
            build_context: ./apps/mysql

    runs-on: ubuntu-latest

    env:
      BUILD_REF: ${{ inputs.ref_name || github.ref_name }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v2
        with:
          ref: ${{ env.BUILD_REF }}

      - name: Checkout Data
        id: checkout_data
        run: |
          echo "::set-output name=head_ref_full::$(git symbolic-ref HEAD)"
          echo "::set-output name=head_ref_short::$(git symbolic-ref --short HEAD)"
          echo "::set-output name=sha_full::$(git rev-parse HEAD)"
          echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: ghcr.io/${{ github.repository }}/${{ matrix.apps.image_name }}
          tags: |
            type=ref,event=tag
            type=raw,value=${{ steps.checkout_data.outputs.head_ref_short }}
            type=raw,value=${{ steps.checkout_data.outputs.sha_short }}

      - id: sshrepo
        name: get the SSH version of the git repository
        uses: ASzc/change-string-case-action@v2
        with:
          string: ${{ format('git@github.com:{0}.git', github.repository) }}

      - name: Log in to the Container registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push Docker image
        uses: docker/build-push-action@v2
        with:
          context: ${{ matrix.apps.build_context }}
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: |
            REPOSITORY_URL=${{ steps.sshrepo.outputs.lowercase }}
            COMMIT_SHA=${{ steps.checkout_data.outputs.sha_short }}
            RELEASE_TAG=${{ steps.checkout_data.outputs.head_ref_short }}