Add GitHub Actions workflow for Ruby testing

[rayartemexatatto-cent]

Overview

Questions

Next steps

Review

[Copilot]

Pull request overview

Adds a dedicated GitHub Actions workflow to run the repository’s Ruby/Rake checks in CI.

Changes:

• Introduces a new .github/workflows/ruby.yml workflow triggered on pushes and PRs to main.
• Runs bundle exec rake using ruby/setup-ruby with bundler-cache, across a Ruby version matrix.

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[Copilot]

The workflow runs bundle exec rake, but it doesn’t install the npm dependencies required for the Jekyll build (e.g., assets/css/index.scss imports @primer/css/index.scss, which comes from node_modules, and _config.yml includes node_modules in Sass load paths). This job will fail unless Node is set up and npm ci/npm install is run before Rake.

Suggested change

	bundler-cache: true # runs 'bundle install' and caches installed gems automatically
	bundler-cache: true # runs 'bundle install' and caches installed gems automatically
	- name: Set up Node
	uses: actions/setup-node@v4
	with:
	node-version: '20'
	- name: Install npm dependencies
	run: npm ci