Musl VMR builds of aspnetcore use wrong RID (linux-X instead of linux-musl-X)

e.g. on https://dev.azure.com/dnceng/internal/_build/results?buildId=2545542&view=artifacts&pathAsName=false&type=publishedArtifacts we created `Microsoft.AspNetCore.App.Runtime.linux-arm64.9.0.0-rc.1.24414.4.nupkg` instead of linux-musl-arm64