Update Dockerfile

Dockerfile

@@ -32,7 +32,7 @@ RUN ls -ahl
 RUN curl -sS https://getcomposer.org/installer | php
 RUN php composer.phar install
 
-RUN curl -L https://npmjs.org/install.sh | sudo sh
+RUN curl -L https://npmjs.org/install.sh | bash
 RUN npm cache clean -f
 RUN npm install -g n
 RUN n stable