Add RSpec tests GitHub Action

This commit adds a GitHub Action to run the test suite.

.github/workflows/rspec-tests.yml

@@ -0,0 +1,30 @@
+---
+name: "RSpec Tests"
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres:14-alpine
+        ports:
+          - "5432:5432"
+        env:
+          POSTGRES_DB: rails_test
+          POSTGRES_USER: rails
+          POSTGRES_PASSWORD: password
+
+    env:
+      RAILS_ENV: test
+      DATABASE_URL: "postgres://rails:password@localhost:5432/rails_test"
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Install Ruby and gems
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+      - run: bundle exec rspec