Add database service configuration to docker-compose

docker-compose.yml

@@ -13,3 +13,20 @@ services:
       DATABASE_URL: "{DATABASE_URL}"
     volumes:
       - .:/app  # sync code for hot reload
+    depends_on:
+      - db
+
+  db:
+    image: postgres:15
+    restart: always
+    environment:
+      POSTGRES_USER: user
+      POSTGRES_PASSWORD: password
+      POSTGRES_DB: dbname
+    ports:
+      - "5432:5432"
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+
+volumes:
+  pgdata: