Updated docker files

docker-compose.yml

@@ -27,6 +27,8 @@ services:
     image: postgres:16.4
     container_name: linker-postgres
     restart: unless-stopped
+    volumes:
+      - ./pgdata:/var/lib/postgresql/data
     environment:
       - POSTGRES_USER=${PG_USER}
       - POSTGRES_PASSWORD=${PG_PASSWORD}