Release builds for arm64

[zwass]

Goal

Some users would like to deploy Fleet on arm64 processors (eg. AWS Graviton).

How?

Attempted cross-compilation in #2429 -- it doesn't work out of the box. Not sure if it can be configured to work or this would require actually building on an arm64 machine.

[zwass]

Possibly helpful with the CGO cross-compilation: https://dh1tw.de/2019/12/cross-compiling-golang-cgo-projects/

[RobertHenry6bev]

+1 on this.

I want to build an arm64 ubuntu deb file on my amd64 ubuntu linux machine (eg, cross compile).

I also want to build an arm64 windows10 msi on my amd64 ubuntu linux machine. Since it seems all of this is written in go, and go has apparently been ported to windows golang/go#36439 this shouldn't be "hard".

(Full disclosure: I'm a Microsoft employee.)

[zwass]

@RobertHenry6bev typically it's easy to cross-compile Go programs -- except if you use CGO, which we do for SQLite. Then you need a C toolchain that can support cross-compilation.

What's your use case for this cross-compilation?