Add GOARM64 support

[tonistiigi]

go1.23 will add GOARM64 variable that we should eventually support as well (practical cases are minimal atm). Minor versions and additional feature description are available as well but as long as we pass through v9 I think that would be good enough for now.

edit:

as long as we pass through v9 I think that would be good enough for now.

I think we can just set any OCI arm64 variant as GOARM64 without further parsing. OCI variant should be equal or subset, but never a superset.