I'm planning on installing the next branch (py3) for testing and potential development. I'd like to do so in a docker container to isolate dependencies. There seems to be a number of starting points including gnuradio-docker and pybombs-docker in the gnuradio repo. There's also a bunch of recipes (what's the docker term?) on hub.docker for various versions. Can someone recommend a good example dockerfile or starting point for building the container? This will be on a Linux box. Appreciated.