CL Foundation docker images

Now that the cl.net git infrastructure has been refreshed, would it be a good time to refresh the CL foundation lisp images? I have sort of figured out how to update the Dockerfiles, but I don't understand how the buildpack works, and the infrastructure that actually does the building and uploads the images is also mysterious to me. Also, it seems like with Eric gone, there's no one to merge any updates into the git repos.