feat: Add EMAIL_FRONTEND_DOMAIN override to Djoser (#8329)

Signed-off-by: germangarces <german.garces@flagsmith.com>
Co-authored-by: Matthew Elwell <matthew.elwell@flagsmith.com>

Author: germangarces

api/app/settings/common.py

@@ -917,6 +917,12 @@
     "SECRET_KEY_LENGTH": 32,
 }
 
+# Controls the app domain used in emails (currently invites and change requests).
+# If set, domain stored with `django.contrib.sites` is disregarded.
+DOMAIN_OVERRIDE = env.str("FLAGSMITH_DOMAIN", "")
+# Used when no Django site is specified.
+DEFAULT_DOMAIN = "app.flagsmith.com"
+
 USER_CREATE_PERMISSIONS = env.list(
     "USER_CREATE_PERMISSIONS", default=["custom_auth.permissions.IsSignupAllowed"]
 )
@@ -928,6 +934,7 @@
     "PASSWORD_RESET_CONFIRM_URL": "password-reset/confirm/{uid}/{token}",
     # if True user required to click activation link in email to activate account
     "SEND_ACTIVATION_EMAIL": env.bool("ENABLE_EMAIL_ACTIVATION", default=False),
+    "EMAIL_FRONTEND_DOMAIN": DOMAIN_OVERRIDE,
     # FE uri to redirect user to from activation email
     "ACTIVATION_URL": "activate/{uid}/{token}",
     # register or activation endpoint will send confirmation email to user
@@ -1294,12 +1301,6 @@
 # Used for serializing and deserializing GenericForeignKey(used in metadata) using the natural key of the object
 SERIALIZATION_MODULES = {"json": "import_export.json_serializers_with_metadata_support"}
 
-# Controls the app domain used in emails (currently invites and change requests).
-# If set, domain stored with `django.contrib.sites` is disregarded.
-DOMAIN_OVERRIDE = env.str("FLAGSMITH_DOMAIN", "")
-# Used when no Django site is specified.
-DEFAULT_DOMAIN = "app.flagsmith.com"
-
 # Define the cooldown duration, in seconds, for password reset emails
 PASSWORD_RESET_EMAIL_COOLDOWN = env.int("PASSWORD_RESET_EMAIL_COOLDOWN", 60 * 60 * 24)
 # Define the threshold, in minutes, for updating the last login timestamp