title: Push Docker Repository to Dockerhub with Jenkins
body: <p>we want to push an docker repository to DockerHub - from the shell is works. But in Jenkins we get the error message <code>"errorDetail":{"message":"unauthorized: access to the requested resource is not authorized"</code></p>
  
  <p>I think the problem is that in shell (docker login) i have to insert the email adress, login and password. In Jenkins i can only set login and password NO email.
  The version of credential plugin is 1.24 and we use docker-build-step for the docker steps.</p>
  
  <p>thx</p>