change uploads permission after creation of user

services/filestore/Dockerfile

@@ -13,11 +13,12 @@ RUN npm run compile:all
 FROM node:8.9.1
 
 COPY --from=0 /app /app
-RUN chown app:app /app/uploads
 # All app and node_modules will be owned by root.
 # The app will run as the 'app' user, and so not have write permissions
 # on any files it doesn't need.
 RUN useradd --user-group --create-home --home-dir /app --shell /bin/false app
+RUN chown app:app /app/uploads
+
 USER app
 WORKDIR /app