name: Publish Build Artifacts

on:
  push:
    branches:
      - master
  pull_request:

permissions:
  contents: read # to fetch code (actions/checkout)

jobs:
  # Optionally publish container images to custom docker repository,
  # guarded by presence of all required github secrets.
  # GitHub secrets can be configured as follows:
  #   - DOCKER_IMAGE = docker.io/myorg/bcc
  #   - DOCKER_USERNAME = username
  #   - DOCKER_PASSWORD = password
  publish_dockerhub:
    name: Publish To Dockerhub
    runs-on: ubuntu-latest
    steps:

    - uses: actions/checkout@v1

    - name: Initialize workflow variables
      id: vars
      shell: bash
      run: |
          if [ -n "${DOCKER_IMAGE}" ] && \
             [ -n "${DOCKER_USERNAME}" ] && \
             [ -n "${DOCKER_PASSWORD}" ];then
            echo "Custom docker credentials set, will push an image"
            echo ::set-output name=DOCKER_PUBLISH::true
          else
            echo "Custom docker credentials not, skipping"
          fi
      env:
        DOCKER_IMAGE: ${{ secrets.DOCKER_IMAGE }}
        DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
        DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}

    - name: Build container image and publish to registry
      id: publish-registry
      uses: elgohr/Publish-Docker-Github-Action@v5
      if: ${{ steps.vars.outputs.DOCKER_PUBLISH }}
      with:
        name: ${{ secrets.DOCKER_IMAGE }}
        username: ${{ secrets.DOCKER_USERNAME }}
        password: ${{ secrets.DOCKER_PASSWORD }}
        workdir: .
        dockerfile: Dockerfile.ubuntu
        snapshot: true
        cache: ${{ github.event_name != 'schedule' }}