main.yml

name: Publish Docker Images

on:
  pull_request:
    branches:
      - development
  push:
    branches: [ development, staging ]
  release:
    types: [ "published" ]
  workflow_dispatch:
    inputs:
      tagName:
        description: 'Tag of the image you want to build and push'
        required: true

jobs:
  build:
    runs-on: ubuntu-latest
    steps:

    - name: Checkout
      uses: actions/checkout@v2

    - name: Prepare
      id: prep
      run: |
        DOCKER_IMAGE=cmusei/steamfitter-api
        VERSION=development
        if [[ ! -z "${{ github.event.inputs.tagName }}" ]]; then
          VERSION=${{ github.event.inputs.tagName }}
          TAGS="${DOCKER_IMAGE}:${VERSION}"
        elif [[ $GITHUB_REF == refs/tags/* ]]; then
          VERSION=${GITHUB_REF#refs/tags/}
          MAJORMINORVERSION=$(echo $VERSION | grep -oP '(\d+)\.(\d+)')
          TAGS="${DOCKER_IMAGE}:${VERSION},${DOCKER_IMAGE}:${MAJORMINORVERSION}"
        elif [[ $GITHUB_REF == refs/heads/* ]]; then
          VERSION=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's#/+#-#g')
          TAGS="${DOCKER_IMAGE}:${VERSION}"
        fi
        if [[ "${{ github.event_name }}" == "pull_request" ]]; then
          echo ::set-output name=push::false
          echo "event is pull_request, not pushing image"
        else        
          echo ::set-output name=push::true
          echo "event is not pull_request, pushing image"
        fi
        echo ::set-output name=version::${VERSION}
        echo ::set-output name=tags::${TAGS}
        echo ::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')

    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v1

    - name: Login to DockerHub
      if: github.event_name != 'pull_request'
      uses: docker/login-action@v1 
      with:
        username: ${{ secrets.DOCKERHUB_USERNAME }}
        password: ${{ secrets.DOCKERHUB_PASSWORD }}

    - name: Build and push
      uses: docker/build-push-action@v2
      with:
        context: .
        file: ./Dockerfile
        push: ${{ steps.prep.outputs.push }}
        pull: true
        tags: ${{ steps.prep.outputs.tags }}
        labels: |
          org.opencontainers.image.source=${{ github.event.repository.clone_url }}
          org.opencontainers.image.created=${{ steps.prep.outputs.created }}
          org.opencontainers.image.revision=${{ github.sha }}