根据http://ruby-china.org/topics/6424上的步骤 修改完 deploy.rb 运行 cap deploy:setup cap deploy:check 都没提示错误 cap deploy:migrations 出现错误如下 executing command ** The --deployment flag requires a Gemfile.lock. Please make sure you have checked ** your Gemfile.lock into version control before deploying. 这是什么情况,请指教