fix: add volume for persistent PostgreSQL data storage in docker-compose

Author: willuhmjs

docker-compose.yaml

@@ -18,6 +18,8 @@ services:
       interval: 5s
       timeout: 2s
       retries: 20
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
 
   server:
     build: 
@@ -34,4 +36,6 @@ services:
       - prisma-network
 networks:
   prisma-network:
-    name: prisma-network
+    name: prisma-network
+volumes:
+  postgres_data: