Docker-Compose with App and DB Service

docker-compose.yaml

@@ -8,9 +8,16 @@ services:
       DATABASE_URL: "postgresql://user:password@db:5432/urlshort"
     depends_on:
       - db
+    networks: backend
+  networks:
+    backend:
+      driver: Bridge
+
+volumes:
+  db_data:
 
   db:
-    image: postgres:16
+    image: postgres:alpine
     container_name: url_db
     restart: always
     environment:
@@ -19,6 +26,4 @@ services:
       POSTGRES_DB: urlshort
     volumes:
       - db_data:/var/lib/postgresql/data
-
-volumes:
-  db_data:
+    networks: backend