in build/BuildSteps.cs [281:289]
public static void CreateRUPackage()
{
FileUtility.EnsureDirectoryExists(Settings.RUPackagePath);
ZipFile.ExtractToDirectory(Settings.BundlePackageNetCoreWindows.GeneratedBundleZipFilePath, Settings.RUPackagePath);
var RURootPackagePath = Directory.GetParent(Settings.RUPackagePath);
ZipFile.CreateFromDirectory(RURootPackagePath.FullName, Path.Combine(Settings.ArtifactsDirectory, $"{BundleConfiguration.Instance.ExtensionBundleId}.{BundleConfiguration.Instance.ExtensionBundleVersion}_RU_package.zip"), CompressionLevel.Optimal, false);
}