Use project version of Ruby in Github actions

Topics: Ruby, Continuous integration, Ruby testing

This GitHub Actions workflow reads the project’s .ruby-version file through ruby/setup-ruby, then enables Bundler caching before running RuboCop.

Subtopics

jobs:
  rubocop:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
    - uses: ruby/setup-ruby@v1
      with:
        ruby-version: .ruby-version
        bundler-cache: true
    - name: RuboCop
      run: bin/rubocop -f github

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