title: Firebase deployment to custom subdomain (not project ID)
body: <p>I want to deploy my react app.</p>
  <p>The project Id is for example <strong>'myapp-2021'</strong>. I created a hosting for <strong>'myapp.web.app'</strong>.</p>
  <p>But when I deploy the app it automatically gets hosted on 'myapp-2021.web.app', which is the project ID.</p>
  <p>How can i change the deployment to the other subdomain?</p>