Add GitHub action

.github/workflows/minitest.yml

@@ -0,0 +1,47 @@
+name: Rails Minitest
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    defaults:
+      run:
+        working-directory: example
+
+    services:
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+        ports:
+          - 5432:5432
+        options:
+          --health-cmd="pg_isready" --health-interval=10s --health-timeout=5s
+          --health-retries=3
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.3.2"
+          bundler-cache: true
+          working-directory: example
+
+      - name: Install dependencies
+        run: bundle install
+
+      - name: Set up database
+        run: |
+          bin/rails db:create
+          bin/rails db:schema:load
+
+      - name: Run tests
+        run: bin/rails test -b