make a seperate network

Signed-off-by: Darshan Kumar <[email protected]>

docker-compose.yml

@@ -11,16 +11,21 @@ services:
     volumes:
       - db-data:/var/lib/postgresql/data
       - ./init.sql:/docker-entrypoint-initdb.d/init.sql
-    ports:
-      - "9899:5432"
+    networks:
+      - nymeria-network
   app:
     container_name: nymeria-app
     build: .
     ports:
       - "9898:9898"
     depends_on:
       - db
+    networks:
+      - nymeria-network
 
 volumes:
   db-data:
     name: nymeria-db
+
+networks:
+  nymeria-network: