community/dotnet6: enable armhf, standardize aport
- stage0 and build fully standardized (i.e., custom patching and fetch logics removed)
- stage0 now pulls bootstraps (cross)built with dotnet6-cross
- thus enabling armhf (with more to come!!)
- RIDs added for eventual alpine-s390x and alpine-x86 port.
Edited by Antoine Martin