title: Change go path explicitly on docker image
body: <p>when I run <code>dep ensure</code> </p>
  
  <p>/home/jenkins/workspace/myproject-voter is not within a known <code>GOPATH/src</code></p>
  
  <p>we have go installed on this docker image , I know that the project is not cloned to <code>go/src</code> but my question is if via <code>set env</code> or something I can do some trick to overcome this issue ? </p>