message: Only run yarn link for packages which have linked modules
diff: @@ -46,11 +46,13 @@ function dockerfile(packages) {
  }
  for (let pack of packages) {
  + if (pack.links.length) {
  let dir = `packages/${pack.name}`;
  let cmd = JSON.stringify(['yarn', 'link', ...pack.links]);
  file.push(`WORKDIR /hub/${dir}`);
  file.push(`RUN ${cmd}`);
  }
  + }
  file.push('WORKDIR /hub');
  