Use latest Ruby version with GHA variable fallback

No need to run against a version matrix here. Ruby 3.0 is no longer supported by ActiveSupport 7.2. This reduces maintenance burden. We'll use a GHA variable fallback so we can also update the version without having to make workflow file changes in the future.

.github/workflows/ci.yml → .github/workflows/tests.yml

@@ -5,21 +5,19 @@ on:
  branches:
  - master
  pull_request:
- branches:
- - master
+
+env:
+ RUBY_VERSION: ${{ vars.RUBY_VERSION || '3.3' }}
 
 jobs:
  build:
  runs-on: ubuntu-latest
- strategy:
- matrix:
- ruby: [ '3.0', '3.1', '3.2' ]
- name: Ruby ${{ matrix.ruby }}
+ name: Ruby ${{ env.RUBY_VERSION }}
  steps:
  - uses: actions/checkout@v4
  - uses: ruby/setup-ruby@v1
  with:
- ruby-version: ${{ matrix.ruby }}
+ ruby-version: ${{ env.RUBY_VERSION }}
  bundler-cache: true # runs 'bundle install' and caches installed gems automatically
  - name: Run Tests
  run: bundle exec rake