title: Multi tenancy in firebase hosting
body: <p>I'm trying to use firebase with different subdomains, but serving the same content.</p>
  
  <p>I've managed to redirect subdomains, but I need to stay routed to it.</p>
  
  <p>When I type for exemple: subdomain.mydomain.com, I'm being redirected to mydomain.com.
  I need it to stay on subdomain.mydomain.com.</p>
  
  <p>The subdomain will be created dynamically.</p>