The examples in the repo all demo how to run a single puppetserver container but don't leverage the horizontal scaling of docker. I've begun testing it on Openshift (Red Hat's container platform based on kuberetes) and have gotten a simple example of puppetserver to scale after a few modifications to the docker image.
I'd be interested in hearing success or failure stories of people who have or have tried to run puppetserver in docker or any container platform.
Mark