message: [frameworks] Add cachePattern to jekyll and middleman
  Cache the results of `bundle install`.
  Related to
diff: @@ -1428,6 +1428,7 @@ export const frameworks = [
  );
  return (config && config.destination) || '_site';
  },
  + cachePattern: '{vendor/bin,vendor/cache,vendor/bundle}/**',
  },
  {
  name: 'Brunch',
  @@ -1498,6 +1499,7 @@ export const frameworks = [
  devCommand: 'bundle exec middleman server -p $PORT',
  buildCommand: 'bundle exec middleman build',
  getOutputDirName: async () => 'build',
  + cachePattern: '{vendor/bin,vendor/cache,vendor/bundle}/**',
  },
  {
  name: 'Zola',
  