Mono.TextTemplating.CodeCompilation RuntimeInfo class do not handle right under Linux and .net6 about t4

[kleve-ops]

OK, if I build the stuff under Windows for Linux then this problem is gone. Looks like that's a problem with the none standard .net6 installation on my Linux machine.
Now the only problem is that PublishSingleFile is not working. Here the Assemblyname is null. Need to adapt the detection of assenbly refs in SIngleFile context.

[kleve-ops]

OK, the problem with GetDotNetCoreSdk () still exists. To solve this please add:
static RuntimeInfo GetDotNetCoreSdk ()
{
static bool DotnetRootIsValid (string root) => !string.IsNullOrEmpty (root) && (File.Exists (Path.Combine (root, "dotnet")) || File.Exists (Path.Combine (root, "dotnet.exe")));

// this should get us something like /usr/local/share/dotnet/shared/Microsoft.NETCore.App/5.0.0
var runtimeDir = Path.GetDirectoryName (typeof (object).Assembly.Location);
if (!runtimeDir.Contains ("Microsoft.NETCore.App") && Environment.GetEnvironmentVariable ("DOTNET_HOST_PATH") != null) {
	runtimeDir = Environment.GetEnvironmentVariable ("DOTNET_HOST_PATH");
}
var dotnetRoot = Path.GetDirectoryName (Path.GetDirectoryName (Path.GetDirectoryName (runtimeDir)));

With that solution we have a workaround via "DOTNET_HOST_PATH".

[mhutch]

@kleve-ops would DOTNET_ROOT be acceptable? It seems like the more appropriate environment variable for our use.