Locked webpack version to 3

Dockerfile

@@ -36,7 +36,7 @@ WORKDIR /webodm/nodeodm/external/node-OpenDroneMap
 RUN npm install --quiet
 
 WORKDIR /webodm
-RUN npm install --quiet -g webpack webpack-cli && npm install --quiet && webpack
+RUN npm install --quiet -g webpack@3.11.0 && npm install --quiet && webpack
 RUN python manage.py collectstatic --noinput
 
 RUN rm /webodm/webodm/secret_key.py

README.md

@@ -306,7 +306,7 @@ Then:
 
 ```bash
 pip install -r requirements.txt
-sudo npm install -g webpack webpack-cli
+sudo npm install -g webpack@3.11.0
 npm install
 webpack
 python manage.py collectstatic --noinput