Migrate to GitHub Actions

.github/workflows/ruby.yml

@@ -0,0 +1,41 @@
+name: "Ruby on Rails CI"
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-20.04
+    services:
+      mysql:
+        image: mysql:5.5
+        ports:
+          - "3306:3306"
+        env:
+          MYSQL_ROOT_PASSWORD: root
+    env:
+      RAILS_ENV: test
+      MYSQL_HOST: 127.0.0.1
+      MYSQL_USERNAME: root
+      MYSQL_PASSWORD: root
+      MYSQL_DATABASE: rails
+      MYSQL_TEST_DATABASE: rails_test
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Install Ruby and gems
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+
+      - name: Setup database
+        run: bundle exec rails db:setup
+
+      - name: Run tests
+        run: bundle exec rspec