title: How to make a prod build in "Ionic upload" command?
body: <p>I want to use Ionic deploy service in Ionic cloud.</p>
  
  <p>When I run <code>ionic upload</code> command, a dev build is immediately triggered instead of prod build.</p>
  
  <p>Is it possible to create a <code>--prod</code> build and upload?</p>
  
  <p>One of major reasons is that multiple configurations in my code are bundled with <code>--prod</code> build only.</p>
  
  <pre><code>ionic upload --deploy=dev
  [INFO] Running app-scripts build:
  
  [09:55:59]  build dev started ...
  [09:55:59]  clean started ...
  [09:55:59]  clean finished in 1 ms
  </code></pre>