Building in a Git worktree causes SourceLink to fail

[dagood]

#> git clone https://github.com/dotnet/arcade
#> cd arcade
#> git worktree add ..\arcade-second
#> cd ..\arcade-second\
#> .\Build.cmd
...
C:\Users\dagood\.nuget\packages\microsoft.sourcelink.common\1.0.0-beta2-19367-01\build\Microsoft.SourceLink.Common.targets(50,5): error : Source control information is not available - the generated source link is empty. [E:\temp\repro-worktree\arcade-second\src\SignCheck\SignCheck\Microsoft.DotNet.SignCheck.csproj]
C:\Users\dagood\.nuget\packages\microsoft.build.tasks.git\1.0.0-beta2-19367-01\build\Microsoft.Build.Tasks.Git.targets(24,5): error : Unable to locate repository with working directory that contains directory 'E:\temp\repro-worktree\arcade-second\src\Microsoft.DotNet.Arcade.Sdk.Tests'. [E:\temp\repro-worktree\arcade-second\src\Microsoft.DotNet.Arcade.Sdk.Tests\Microsoft.DotNet.Arcade.Sdk.Tests.csproj]
C:\Users\dagood\.nuget\packages\microsoft.sourcelink.common\1.0.0-beta2-19367-01\build\Microsoft.SourceLink.Common.targets(50,5): error : Source control information is not available - the generated source link is empty. [E:\temp\repro-worktree\arcade-second\src\Microsoft.DotNet.Arcade.Sdk.Tests\Microsoft.DotNet.Arcade.Sdk.Tests.csproj]
    0 Warning(s)
    128 Error(s)

Time Elapsed 00:00:36.42
Build failed.

Worktree is really useful to allow me to use incremental builds on my dev box while porting a lot of changes between branches. Would be great for it to work with sourcelink enabled.

@tmat

[dagood]

Oh, it looks like this is reported on SourceLink itself: dotnet/sourcelink#347.