[Suggestion] Dockerized builds on docker hub

[tzapu]

as it says on the tin. don't really wanna mess around with all the python deps which seem to be a mess between py 2 and 3 on macos

[cleanunicorn]

This is a good idea. I'm not a docker guru so this will take a bit of a while and it will probably not be optimal.
I have to add this in the circleci process.

[cleanunicorn]

Pushing this in the future.

Is there still a need for this?