possibility for an aarch64 build

[pcause]

It would be very useful to have an aarch64 build (.tar.gz) of taskwarrior. The raspberry pi and the crostini environment on Chromebooks would benefit and we are also starting to see ARM laptops and desktops available.

[djmitche]

That sounds great -- do you want to make a PR to do it?

[Iheanacho-ai]

i could work on this @djmitche

[djmitche]

Sounds good!