Example workflow used in this article: https://medium.com/@merlin.pav/cc1e2aacd9da?source=friends_link&sk=dcb39201c9d8bf917e1329af08ea1719

github_article_sample_ci_workflow.yaml

name: CI

on:
  push:
    branches:
      - '**'

jobs:
  tests:
    name: Tests
    runs-on: ubuntu-latest

    services:
      backend-db:
        image: postgres:12.1
        env:
          POSTGRES_USER: user
          POSTGRES_PASSWORD: password
          POSTGRES_DB: backend_db
        ports:
        - 5432:5432
      backend-gcloud-pubsub:
        image: 'knarz/pubsub-emulator'
        ports:
          - '8085:8085'
    steps:

    - name: Checkout working branch
      uses: actions/checkout@v1

    - name: Setup ssh
      run: |
        mkdir ~/.ssh/
        echo "${{ secrets.SSH_PRIVATE_KEY }}" > ~/.ssh/id_rsa
        chmod 600 ~/.ssh/id_rsa
        touch ~/.ssh/known_hosts
        ssh-keyscan github.com >> ~/.ssh/known_hosts

    - name: Set up Python 3.8
      uses: actions/setup-python@v1
      with:
        python-version: 3.8

    - name: Install PostgreSQL 11 client
      run: |
        sudo apt-get -yqq install libpq-dev

    - name: Cache Poetry
      uses: actions/cache@v1
      id: cache
      with:
        path: ~/.cache/pip
        key: ${{ runner.os }}-pip-${{ hashFiles('**/poetry.lock') }}
        restore-keys: |
          ${{ runner.os }}-pip-

    - name: Install dependencies, config poetry virtualenv
      run: |
        python -m pip install --upgrade pip
        pip install poetry
        poetry config virtualenvs.create false
        poetry install --no-interaction

    - name: Lint with flake8
      run: |
        pip install flake8
        # stop the build if there are Python syntax errors or undefined names
        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics

    - name: Install gettext for translations
      run: |
        sudo apt-get update && sudo apt-get install -y gettext
    - name: Test with pytest
      run: |
        python manage.py compilemessages
        pytest --verbose
      env:
        CLUSTER_ENV: test
        RUN_DEV: 0
        POSTGRES_DB: backend_db
        POSTGRES_USER: user
        POSTGRES_PASSWORD: password
        POSTGRES_DB_PORT: 5432
        POSTGRES_DB_HOST: localhost
        SECRET_KEY: thisisasecret
        SENDGRID_API_KEY: 'test-key'
        PUBSUB_EMULATOR_HOST: localhost:8085
        GCLOUD_PUBSUB_PROJECT_ID: 'test-project'
        HERBIE_TOKEN: 'random-key'
        HERBIE_HOST: 'http://localhost:8000'

  docker-image:

    name: Build & Publish Docker Image
    needs: [tests]
    runs-on: ubuntu-latest

    steps:
      - name: Checkout working branch
        uses: actions/checkout@v1

      - name: Set Docker Registry
        run: echo ::set-env name=DOCKER_REGISTRY::eu.gcr.io

      - name: Set Docker Image
        run: echo ::set-env name=DOCKER_IMAGE::${{ env.DOCKER_REGISTRY }}/acme-555555/backend

      - uses: actions/checkout@v1
      - name: Login to gcloud registry
        id: gcloud
        uses: elgohr/gcloud-login-action@0.2
        with:
          account_key: ${{ secrets.GCLOUD_KEY }}

      - name: Publish Docker Image
        uses: elgohr/Publish-Docker-Github-Action@2.14
        env:
          SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
        with:
          name: ${{ env.DOCKER_IMAGE }}
          username: ${{ steps.gcloud.outputs.username }}
          password: ${{ steps.gcloud.outputs.password }}
          registry: ${{ env.DOCKER_REGISTRY }}
          buildargs: SSH_PRIVATE_KEY