db volume for persistent storage

docker-compose.yml

@@ -2,6 +2,9 @@ networks:
   app-network:
     driver: bridge
 
+volumes:
+  dbdata:
+
 services:
   nginx:
     build:
@@ -65,6 +68,8 @@ services:
       - ./.env
     networks:
       - app-network
+    volumes:
+      - dbdata:/var/lib/postgresql/data
 
   icecast2:
     build: