make user upload persistent

backend @ f95066a2

-Subproject commit f789b573c6f01f2496c7d8eb1b0e5c7082bbf6dc
+Subproject commit f95066a2ba107dec3d5bb7d6b47ecdb9fee23a67

docker-compose.yml

@@ -3,6 +3,8 @@ version: "2"
 volumes:
   database:
     driver: local
+  files:
+    driver: local
 
 services:
   frontend:
@@ -20,6 +22,8 @@ services:
     ports:
       - "4000:4000"
     restart: always
+    volumes:
+      - files:/usr/src/app/public/
 
   # The nginx image is created with multi stage build
   # We first run a nodejs container to build the reactjs app