Add arm as build target

[asachs01]

As a Sensu user, I'd like to be able to run checks from a raspberry pi, or other arm-based platform. Adding arm as a build target would allow me to do that.

[sensu-discourse]

This issue has been mentioned on Sensu Community. There might be relevant details there:

https://discourse.sensu.io/t/sensu-install-for-armv6-boards/2920/4

[jspaleta]

It's not impossible, but it would require the development of arm compatible github actions cross compile workflow for ruby runtime assets. Github doesn't provide any native support yet for arm targets.