Example GitHub Actions configurations for a Rails app

build.yml

# .github/workflows/build.yml
name: Build

on: [push, pull_request]

jobs:
  build:
    runs-on: ubuntu-latest
    env:
      RAILS_ENV: test
    services:
      postgres:
        image: postgres:12.0
        env:
          POSTGRES_USER: postgres
          POSTGRES_PASSWORD: "postgres"
          POSTGRES_DB: postgres
        ports:
          - 5432/tcp
        # needed because the postgres container does not provide a healthcheck
        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
        
    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 1
            
      - name: apt-get
        run: |
          sudo apt-get update -y
          sudo apt-get install -y libpq-dev postgresql-client

      - name: Set up Redis
        uses: shogo82148/actions-setup-redis@v1
        with:
          redis-version: '5.x'

      - name: Set up Ruby
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: 2.7
        
      - name: Cache gems
        uses: actions/cache@v1
        with:
          path: vendor/bundle
          key: bundle-use-ruby-${{ runner.os }}-${{ hashFiles('.ruby-version') }}-${{ hashFiles('**/Gemfile.lock') }}
          restore-keys: |
            bundle-use-ruby-${{ runner.os }}-${{ hashFiles('.ruby-version') }}-

      - name: bundle install
        run: |
          bundle config path vendor/bundle
          bundle install --jobs 4 --retry 3
          
      - name: Get Yarn cache directory
        id: yarn-cache-dir
        run: echo "::set-output name=dir::$(yarn cache dir)"
        
      - name: Cache node modules
        id: yarn-cache
        uses: actions/cache@v1
        with:
          path: ${{ steps.yarn-cache-dir.outputs.dir }}
          key: ${{ runner.os }}-js-${{ hashFiles('**/yarn.lock') }}
          restore-keys: |
            ${{ runner.os }}-js-
            
      - name: yarn install
        run:  yarn install --dev
        
      - name: Setup database
        run: bin/rails db:create db:migrate
        
      - name: RSpec
        run: bin/rspec
        
      - name: Rubocop
        run: bin/rubocop --parallel