ARM64 Github CI

[Ryan Schmidt]

On Mar 24, 2021, at 17:50, Joshua Root wrote:

> we would have to set up a self-hosted runner.

People have expressed interest in this (for x86_64) every now and then over the years, but as of now we have no ability to do this. Software would need to be written to allow this to happen. And then we would either need separate hardware to run it on, or the software would need to be written in such a way that it could coexist with the existing buildbot hardware (for example in a non-root MacPorts installation in another prefix, but a subset of ports are not able to be built in non-root installations).