message: fix(@nguniversal/builders): index.original.html should be used if exists
diff: @@ -50,7 +50,10 @@ export async function render(
  const { renderModule, AppServerModule } = await import(serverBundlePath);
  - const browserIndexInputPath = path.join(outputPath, workerArgs.indexFile);
  + const indexBaseName = fs.existsSync(path.join(outputPath, 'index.original.html'))
  + ? 'index.original.html'
  + : workerArgs.indexFile;
  + const browserIndexInputPath = path.join(outputPath, indexBaseName);
  let indexHtml = await fs.promises.readFile(browserIndexInputPath, 'utf8');
  indexHtml = indexHtml.replace(
  '</html>',
  