title: How to I use sidekiq's perform_at from a rake task?
body: <p>I have a rake task, which extends environment, where I call <code>MyWorker.perform_at ...</code></p>
  
  <p>This has no effect from the rake task. It's as if it's a NO-OP.
  I have verified that the same code works in the app, and in the Rails console.</p>
  
  <p>I've put logging into my config/initializers/sidekiq.rb file as a sanity-check that it's getting run and doing what I expect.</p>
  
  <p>Am I missing something?</p>