change netcore runtime in debug adapter from linux-x64 to linux-musl-x64

[newdigate]

the runtime id for alpine is: linux-musl-x64 (...here https://learn.microsoft.com/en-us/dotnet/core/rid-catalog)

# curl -sSL https://aka.ms/getvsdbgsh | sh /dev/stdin -v latest -l /dbg/netcore -r linux-musl-x64

when I run this on the pod i am trying to debug, it all magically starts working.

otherwise I always just get "Failed to start process".... (because cloudcode had installed the linux-x64 runtime debugger incorrectly.