Setup GitHub actions instead of circle CI

.github/workflows/ci.yml

@@ -0,0 +1,45 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    services:
+      postgres:
+        image: postgres:14.13
+        env:
+          POSTGRES_DB: rails_contributors_test
+          POSTGRES_PASSWORD: postgres
+        ports:
+          - 5432:5432
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+
+    env:
+      BUNDLE_PATH: vendor/bundle
+      DATABASE_URL: postgres://postgres:postgres@localhost:5432/rails_contributors_test
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Install system dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y git cmake pkg-config curl libpq-dev tzdata
+
+    - name: Clone rails.git
+      run: git clone --mirror https://github.com/rails/rails.git
+
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 3.3.4
+        bundler-cache: true
+
+    - name: Run tests
+      run: bin/rails test