After a bit of research and a lot of trial and error I finally got Github Actions working for CI on a Rails 7 (alpha 2) app that uses Postgres, esbuild and Tailwind CSS, plus StandardRB for formatting

It’s kind of hard to believe, but it seems you get it all for free!

Here’s what worked for me:

# test_and_lint.yml
name: Test and Lint

on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]

jobs:
  build-and-test:
    runs-on: ubuntu-latest

    services:
      postgres:
        image: postgres
        env:
          POSTGRES_USER: postgres
          POSTGRES_PASSWORD: postgres
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
        ports:
          - 5432:5432

    steps:
      - uses: actions/checkout@v2

      - uses: ruby/setup-ruby@v1
        with:
          bundler-cache: true

      - name: Install yarn and build assets
        run: |
          yarn --frozen-lockfile
          yarn build
          yarn build:css

      - name: Install psql
        run: sudo apt-get -yqq install libpq-dev

      - name: Build DB
        env:
          PGHOST: localhost
          PGUSER: postgres
          PGPASSWORD: postgres
          RAILS_ENV: test
        run: bin/rails db:setup

      - name: Run Tests
        env:
          PGHOST: localhost
          PGUSER: postgres
          PGPASSWORD: postgres
          RAILS_ENV: test
        run: |
          bundle exec rake test
          bundle exec rake test:system

  lint:
    runs-on: ubuntu-latest
    steps:
      - name: standardrb
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        uses: amoeba/standardrb-action@v2

Big thanks to Andy Croll, his instructions were super helpful to get the basic build and test workflow working with Postgres.

Vincent Voyer’s instructions were helpful for the yarn installation step.

From there, I just needed to add the yarn build and yarn build-css commands to trigger the build steps defined in package.json.