Switch test suite from Minitest to RSpec

[andrew]

Follow-up from #30 (comment) — the rest of the Homebrew org standardised on RSpec, so bring this repo in line.

spec/repology_index_spec.rb is a 1:1 port of test/repology_index_test.rb (30 examples), grouped into describe blocks per method. ScriptedIndex becomes an anonymous Class.new(described_class) in a let so it doesn't leak a top-level constant. Fixtures move to spec/fixtures/ unchanged.

Adds a Gemfile (rake + rspec); Homebrew/actions/setup-ruby already runs bundle install when one is present, so both workflows just gain bundler-cache: true and switch rake test → bundle exec rake spec. dependabot.yml is org-synced so no bundler ecosystem entry is added here.

#30 adds test/advisory_index_test.rb; whichever of these merges second will need a small follow-up to convert or add that file under spec/.

[Copilot]

Pull request overview

This PR migrates the repository’s Ruby test suite from Minitest to RSpec to align with Homebrew org standards, updates CI to run the new spec task, and introduces Bundler-managed dependencies for consistent local/CI execution.

Changes:

• Replaced the Minitest test suite with an RSpec spec suite (including fixture relocation).
• Added Bundler files (Gemfile, Gemfile.lock) and RSpec configuration (.rspec, spec/spec_helper.rb).
• Updated Rake and GitHub Actions workflows to run bundle exec rake spec (and bundle exec rake repology:build where applicable) with bundler-cache: true.

Reviewed changes

Copilot reviewed 9 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/test_helper.rb	Removed Minitest shared helper (no longer needed after migration).
test/repology_index_test.rb	Removed Minitest coverage for RepologyIndex (replaced by RSpec).
spec/spec_helper.rb	Added shared RSpec helpers and configuration (fixtures, load path, ordering).
spec/repology_index_spec.rb	Added RSpec port of the prior Minitest suite for RepologyIndex.
spec/fixtures/repology_page1.json	Added fixture data under spec/fixtures/ for RSpec suite.
spec/fixtures/repology_page2.json	Added fixture data under spec/fixtures/ for RSpec suite.
Rakefile	Switched from rake test task to rake spec via RSpec::Core::RakeTask.
Gemfile	Added Bundler dependencies for rake and rspec.
Gemfile.lock	Locked dependency versions for consistent installs.
.rspec	Configured RSpec to require spec_helper.
.gitignore	Ignored Bundler install/cache directories.
.github/workflows/validate.yml	Updated CI to use Bundler cache and run bundle exec rake spec.
.github/workflows/regenerate.yml	Updated scheduled workflow to use Bundler cache and run spec + repology build via Bundler.

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[p-linnane]

Nice!