title: Upload single file to firebase hosting via CLI or other without deleting existing ones?
body: <p><strong>Question:</strong></p>
  
  <p>How to upload a single file to firebase without deleting existing files?</p>
  
  <p><strong>Details:</strong></p>
  
  <ul>
  <li><p><strong>Intent:</strong> upload single file without deleting existing files on server</p></li>
  <li><p><strong>Usage:</strong> have separate directories on local machine each uploading to a specific folder on server</p></li>
  <li><p><strong>What I've tried:</strong> overriding the public dir with <code>firebase deploy -p file.txt</code>, this results in setting root public dir to use that dir.</p></li>
  </ul>