title: Issue running Gulp on Docker
body: <p>I have the following Dockerfile</p>
  
  <pre><code>FROM debian:jessie
  
  MAINTAINER Ewan Valentine &lt;ewan@theladbible.com&gt;
  
  WORKDIR /tmp
  
  RUN apt-get update -y &amp;&amp; \ 
      apt-get install -y \
      curl
  
  RUN curl --silent --location https://deb.nodesource.com/setup_0.12 | bash -
  RUN apt-get install --yes nodejs
  
  VOLUME ["/var/www/admin/src"]
  
  RUN mkdir -p /var/www/admin/src
  WORKDIR /var/www/admin/src
  
  RUN npm install -g gulp
  
  ENTRYPOINT ["gulp"]
  </code></pre>
  
  <p>However, when I run <code>$ docker-compose run gulp</code> I get the following error:</p>
  
  <pre><code>[10:47:49] Local gulp not found in /var/www/admin/src
  [10:47:49] Try running: npm install gulp
  </code></pre>
  
  <p>I'm using docker-compose and this container is linked to a volume where the source code is kept, which all runs fine otherwise. </p>