nuget-to-nix: add meta.mainProgram (#347459)

Author: corngood

pkgs/build-support/dotnet/nuget-to-nix/default.nix

@@ -28,7 +28,10 @@ runCommandLocal "nuget-to-nix" {
     ];
   };
 
-  meta.description = "Convert a nuget packages directory to a lockfile for buildDotnetModule";
+  meta = {
+    description = "Convert a nuget packages directory to a lockfile for buildDotnetModule";
+    mainProgram = "nuget-to-nix";
+  };
 } ''
   install -Dm755 $script $out/bin/nuget-to-nix
 ''