don't manage volume path with podman

docker-compose.yml

@@ -1,15 +1,10 @@
 version: '3.3'
 
-volumes:
-  db_data:
-    external:
-      name: db_data
-
 services:
   db:
     image: mysql:5.7
     volumes:
-      - db_data:/var/lib/mysql
+      - ../db_data/_data/:/var/lib/mysql
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: $MYSQL_ROOT_PASSWORD