Update Dockerfile

Author: chilio

Dockerfile

@@ -151,7 +151,7 @@ RUN chmod +x phpunit.phar
 RUN mv phpunit.phar /usr/local/bin/phpunit
 
 RUN npm install -g node-gyp
-RUN npm install -g node-sass
+RUN npm install --unsafe-perm -g node-sass
 RUN npm install -g gulp
 
 RUN apt-get update && apt-get install -y supervisor