upgrade node and npm in dockerfile

Dockerfile

@@ -10,9 +10,19 @@ RUN pip install -r requirements.txt -r requirements_dev.txt
 RUN if [ "x$skip_ds_deps" = "x" ] ; then pip install -r requirements_all_ds.txt ; else echo "Skipping pip install -r requirements_all_ds.txt" ; fi
 
 COPY . ./
+RUN npm install && npm run bundle && npm run build && rm -rf node_modules
+
+# Upgrade node to LTS 6.11.2
+RUN cd ~
+RUN wget https://nodejs.org/download/release/v6.11.2/node-v6.11.2-linux-x64.tar.gz
+RUN sudo tar --strip-components 1 -xzvf node-v* -C /usr/local
+
+# Upgrade npm
+RUN npm upgrade npm
+
 RUN npm install && npm run bundle && npm run build && rm -rf node_modules
 RUN chown -R redash /app
 USER redash
 
 ENTRYPOINT ["/app/bin/docker-entrypoint"]
-CMD ["server"]
+CMD ["server"]