Use an action to set up Ruby, Ruby gems and then run a Ruby script.

This is using an action owned by the ruby GH account. Don’t confuse with action of same name owned by actions account.

ruby - setup-ruby

From the action’s docs, if you use bundle-cache option, that means gems will be set up for you. It effectively does bundle install and then caches gems between builds. You can remove that option below, if you have no gems to install.

  • main.yml 
      steps:
    - name: Checkout 🛎️
      uses: actions/checkout@v2

    - name: Set up Ruby 💎
      uses: ruby/setup-ruby@v1
      with:
        ruby-version: '2.7'
        bundler-cache: true

    - name: Run
      run: bundle exec ruby hello.rb

You can pass more options as environment variables, on the job or step.

env:
  BUNDLE_JOBS: 4
  BUNDLE_RETRY: 3