title: How send request every 2 seconds with Sidekiq?
body: <p>I have worker that send request to server and checks exist file.
  Now worker runs at the specified time:</p>
  
  <p><code> CheckFileWorker.perform_in(@target_file.check_start_date, @target_file.url) </code></p>
  
  <ol>
  <li>I want run worker every 2 second. How I can do it?</li>
  <li>May be need second Worker who will starting first Worker?</li>
  </ol>