Feature Request: also build for arm64 architecture

[lemeurherve]

In an effort to reduce our costs by migrating several of Jenkins infrastructure services to arm64, I've created a PoC for running mirrorbits on arm64: https://github.com/jenkins-infra/docker-mirrorbits/pull/18

It would be nice to configure the build of this repository to also produce arm64 binaries so we could rely on them for running mirrorbits on arm64.

[lemeurherve]

Looking into it, will open a PR when ready.

[elboulangero]

Note that there's package in Debian (unstable/testing only). It's built for all architectures: https://buildd.debian.org/status/package.php?p=mirrorbits

[jbkempf]

Shouldn't be hard :)

Addition welcomed.