title: How can I set .bash_profile environment variable in Dockerfile?
body: <p>I want to set bash environment variable in Dockerfile.<br>
  How I can do it? </p>
  
  <p>Host: OS X 10.11.4<br>
  Guest: ubuntu:latest</p>
  
  <p>Dockerfile:</p>
  
  <pre><code>RUN mkdir ~/gopath_dir
  RUN apt-get install ubuntu-make
  RUN umake go
  
  # I want to set $GOPATH to ~/gopath_dir
  </code></pre>