As we are still using cube in our company I made some effort to create a docker image version. I was not able to get the 'full-merge' of Marsup to run, but from our current installation I got a working container together. As it includes the node_modules dependencies this is not really a version to build upon, but maybe someone else with more experience in building a working version might use my changes for creating a different image built on a more elaborated branch.
Please find the instructions and the code for the docker image here:
https://github.com/JHK/cube/tree/dockerize#dockerRegards,
Julian