[Glitch] Change how CDN_HOST is passed down to make assets build reproducible

Port 4c45b43cb8 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/core/auth.js

@@ -1,2 +1,3 @@
+import 'packs/public-path';
 import './settings';
 import './two_factor_authentication';