Set app domain to env var to add to host list

src/grubguesser/settings.py

@@ -28,9 +28,9 @@ DEBUG = os.getenv("DEBUG_MODE", "False").lower() == "true"
 
 ALLOWED_HOSTS: list = []
 
-app_name = os.getenv("HEROKU_APP_NAME")
-if app_name:
-    ALLOWED_HOSTS.append(f"{app_name}.herokuapp.com")
+app_domain = os.getenv("HF_SPACE_DOMAIN")
+if app_domain:
+    ALLOWED_HOSTS.append(app_domain)
 
 
 # Application definition