Comment 3 for bug 1788892

Basic auth is now supported in the stable docker-registry charm:

https://jujucharms.com/u/containers/docker-registry

And can be configured as described in the readme:

https://github.com/CanonicalLtd/docker-registry-charm#authentication

With kubernetes-worker revision 385 or greater, a relation can be made between the registry and k8s-worker which will enable the worker to login to the registry with the configured basic auth.