Set up GitHub Actions to run tests

.github/workflows/ci.yml

@@ -0,0 +1,31 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  name: Tests
+  runs-on: ubuntu-latest
+  steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Setup Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 3.3.0
+        bundler-cache: true
+
+    - name: Install dependencies
+      run: |
+        bundle install --jobs 4 --retry 3
+
+    - name: Run Tests
+      env:
+        RAILS_ENV: test
+      run: |
+        bundle exec rails db:migrate
+        bundle exec rails test