code: function build(done, errorShouldExit, watchTask) {
      const cd = config.cwd ? `cd ${config.cwd} && ` : '';
      core.utils.sh(`${cd}${config.commandPrefix} build --incremental${watchTask ? ' --watch' : ''}`, errorShouldExit, (err) => {
        done(err);
      });
    }
docs: Build Jekyll
  @param done
  @param errorShouldExit {Boolean} [false] - Should it stop the script if an error happens?
  @param watchTask {Boolean} [false] - Is this a watch task?