title: Adding tags to docker image from jenkins
body: <p>I have a jenkins instance (which actually runs inside docker) for my Continous Integration.</p>
  
  <p>The jenkins server builds docker images on an external docker host, tests them and then pushes them to tagged with <code>my-app:tested</code>.</p>
  
  <p>Now, when I build a release, I want to re-tag the docker image from tested to <code>vX.X</code>. I do <strong>not</strong> want rebuild the image with a new tag, I want to re-tag the existing image.</p>
  
  <p>How can this be done with jenkins? I am looking through the jenkins plugins and cannot find any with this capability.</p>