docker node_modules in its own volume (#9509)

docker-compose.yml

@@ -29,6 +29,7 @@ x-superset-volumes: &superset-volumes
   - ./docker/pythonpath_dev:/app/pythonpath
   - ./superset:/app/superset
   - ./superset-frontend:/app/superset-frontend
+  - node_modules:/app/superset-frontend/node_modules
   - superset_home:/app/superset_home
 
 version: "3.7"
@@ -85,6 +86,8 @@ services:
 volumes:
   superset_home:
     external: false
+  node_modules:
+    external: false
   db_home:
     external: false
   redis: