update mongo data mount point to volume

docker-compose-dev.yaml

@@ -1,16 +1,16 @@
-version: "3.3"
+version: "3"
+
 services:
   mongo:
     image: mongo
-    restart: always
     environment:
       MONGO_INITDB_ROOT_USERNAME: xcoder
       MONGO_INITDB_ROOT_PASSWORD: 4dun4710
     volumes:
-      - ./mongo_data_dir/:/data/db/
+      - mongo_data:/data/db/
+  
   mongo-express:
     image: mongo-express
-    restart: always
     ports:
       - 8081:8081
     environment:
@@ -19,13 +19,16 @@ services:
       ME_CONFIG_OPTIONS_EDITORTHEME: ambiance
       ME_CONFIG_BASICAUTH_USERNAME: xcoder
       ME_CONFIG_BASICAUTH_PASSWORD: 4dun4710
+  
   web:
     build: .
-
     ports:
-      - "5000:5000"
+      - 5000:5000
     environment:
       ADUNATIO_PRIV_KEY: /code/privkey.pem
       FLASK_DEBUG: 1
     volumes:
       - .:/code
+
+volumes:
+  mongo_data: