Add GitHub Actions CI workflow for running tests

Co-authored-by: nhorton <[email protected]>

Author: Copilot

.github/workflows/ci.yml

@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ['3.0', '3.1', '3.2', '3.3']
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up Ruby ${{ matrix.ruby-version }}
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true
+    
+    - name: Install dependencies
+      run: bundle install
+    
+    - name: Run tests
+      run: bundle exec rspec