Add test workflow (#1)

* Add test workflow

* Add rake to Gemfile

Author: presidentbeef

.github/workflows/ruby.yml

@@ -0,0 +1,27 @@
+name: Ruby
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ['3.2', '3.3', '3.4']
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - name: Run tests
+      run: bundle exec rake

Gemfile

@@ -4,4 +4,5 @@ gemspec
 
 group :test do
   gem 'minitest'
+  gem 'rake'
 end