Add postgres service to workflow for running examples

.github/workflows/ci.yml

@@ -24,6 +24,23 @@ jobs:
 
     runs-on: ${{ matrix.os }}
 
+    services:
+      postgres:
+        image: postgres:15
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: postgres
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd="pg_isready"
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=5
+        # Give PostgreSQL some time to start
+        timeout-minutes: 5
+
     steps:
       - name: Check out repository
         uses: actions/checkout@v4