New Brownie Mix for Gitlab

[theref]

I have a working implementation of brownie/ganache/docker for use with Gitlab's CI/CD that I think would make a great Mix.

I'm fully aware that this is definitely the wrong place for this question, but I couldn't see anywhere in the Github organization on how to contribute a new Mix. @iamdefinitelyahuman if this is something you think would be beneficial, could you reach out with how to get it added? thank you!