Dockerise and wrap with a golang builder

[joeblew99]

Make it easy for devs on all OS's to build the GRPC bindings for any language.

I like this as a basis: https://github.com/lucor/fyne-cross
It runs from any developer desktop and runs cross compilation in docker.
It then returns the results ( in this case a built binary) back to the host in the same directory.
The dev has no involvement with docker and the golang code does it all.

People will want to build their grpc implementation in different languages for Servers and desktops and so this provides that.

Its 100% golang, and so its possible to have it call the nodejs, python, c# installers and boot strap correctly for each Language / OS Permutation.

THis will also make it ease to do CI

[tylertreat]

Cool, will take a look at that when I get a chance.