Deployment + Challenge Management

At one point CTFd managed docker containers for CTFs. This wasn't used very often and was poorly implemented.

Docker has progressed much farther since its use and I think it's useful for CTFd to get involved in the management of challenges themselves.

This could be quite complex so I want to ask the community about different ways they might get this done. I thought that you could get away with wrappers around a Docker registry.