Ensure we're not affected by other [NUKE] changes harder

Author: Perksey

build/nuke/Build.Native.cs

@@ -256,7 +256,8 @@ void PrUpdatedNativeBinary(string name)
             var curCommit = GitCurrentCommit(RootDirectory);
             Git($"commit -m \"New binaries for {name} on {RuntimeInformation.OSDescription}\"");
             // ensure there are no other changes
-            Git("checkout HEAD", RootDirectory);
+            Git("checkout HEAD .nuke/", RootDirectory);
+            Git("reset --hard", RootDirectory);
             if (GitCurrentCommit(RootDirectory) != curCommit) // might get "nothing to commit", you never know...
             {
                 Logger.Info("Checking for existing branch...");