ARM64 support

[sadiepowell]

Currently we only ship x86_64 packages. Given the recent interest in ARM64 it'd be good if we could ship packages for that too.

CentOS: https://wiki.centos.org/SpecialInterestGroup/AltArch/AArch64

Debian: https://wiki.debian.org/Arm64Port

Ubuntu: https://ubuntu.com/download/server/arm

[sadiepowell]

Possibly useful: https://github.com/multiarch/qemu-user-static

[rmvpress]

I'm currently running inspircd-2.0.25 on an orange pi 3 lts and would love to be able to upgrade to v3 but since there's no package and I'm not super tech savvy I'm not sure how to go about it, I mostly just want to upgrade to v3 cus I can't figure out how to have people be able to register their nicknames and stuff on the server and what not with v2