Distribute arm64 releases

[scothis]

Apple Silicon is here and uses arm64 instructions instead of x86. k14s/carvel tools run fine on Apple Silicon when built with go1.16 (currently in beta) via go get. It would be nice to brew install/update carvel tools.

$ brew install kapp
==> Installing kapp from k14s/tap
kapp: The x86_64 architecture is required for this software.
Error: An unsatisfied requirement failed this build.

[joaopapereira]

Hey, @scothis do you mind creating this issue in https://github.com/vmware-tanzu/homebrew-carvel? We are deprecating the use of this tap and we will only update the new tap with the newer versions of the carvel tools.

Thanks