Add GitHub Actions workflow for automated testing

[Copilot]

This PR adds a GitHub Actions workflow to automatically run tests on push and pull requests, addressing the need for continuous integration.

Changes Made

• Created .github/workflows/test.yml with a comprehensive CI workflow
• Configured testing across Ruby versions 3.0, 3.1, 3.2, and 3.3
• Used modern GitHub Actions best practices:
  • actions/checkout@v4 for code checkout
  • ruby/setup-ruby@v1 for Ruby environment setup
  • Automatic dependency caching with bundler-cache: true
  • Runs tests using bundle exec rake test

Workflow Features

The workflow triggers on:

• Push to main or master branches
• Pull requests targeting main or master branches

The test matrix ensures compatibility across multiple Ruby versions, providing confidence that the gem works correctly in different environments.

Testing

• ✅ YAML syntax validated locally
• ✅ Workflow configuration follows GitHub Actions best practices
• ✅ Uses the existing test infrastructure (rake test with minitest)
• ✅ Leverages existing dependency management (Bundler with Gemfile)

This workflow can be extended in the future to include appraisal testing for different ActiveSupport versions if needed.

This pull request was created as a result of the following prompt from Copilot chat.

Add a GitHub action to run the tests.

The action should:

• checkout the code
• setup ruby
• install dependencies
• run tests

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[sshaw]

@copilot we need to update Rake, it's causing tests to fail. We can just remove the version restriction here: https://github.com/sshaw/class2/blob/copilot%2Ffix-b6485cde-19d9-4943-beed-ef9a57ede3c8/class2.gemspec#L24

[Copilot]

@copilot we need to update Rake, it's causing tests to fail. We can just remove the version restriction here: https://github.com/sshaw/class2/blob/copilot%2Ffix-b6485cde-19d9-4943-beed-ef9a57ede3c8/cl...

I've removed the Rake version restriction from line 24 of the gemspec. The change allows the gem to work with modern Rake versions instead of being locked to ~> 10.0. This should fix the test failures in the GitHub Actions workflow. (ed17a73)