How to clean up old images in docker registry with jenkins

I have a jenkins multi branch project, that builds on every commit and pushes the image to our private registry:

docker-reg:5000/<project>/<branch>:latestdocker-reg:5000/<project>/<branch>:<build-server>-<build-number>

How can I delete the labels in the docker registry in order to let the garbage collector kick in upon:

• build gets orphaned after some time
  • remove <project>/<branch>:<build-server>-<build-number
• branch gets merged and jenkins sub project gets automatically deleted
  • remove <project>/<branch>:latest