fix: db should preserve data by default

docker-compose.yml

@@ -55,6 +55,8 @@ services:
   db:
     container_name: db
     image: mariadb
+    volumes:
+      - db_data:/var/lib/mysql
     environment:
       MARIADB_RANDOM_ROOT_PASSWORD: true
       MARIADB_USER: ${DB_USER}
@@ -66,6 +68,7 @@ services:
 
 volumes:
   webroot:
+  db_data:
 
 networks:
   app-network: