feat: provide instance name through dandischema instance config

instead of a hardcoded value

Author: candleindark

dandiapi/api/views/dandiset.py

@@ -4,6 +4,7 @@
 from typing import TYPE_CHECKING
 
 from allauth.socialaccount.models import SocialAccount
+from django.conf import settings
 from django.contrib.auth.models import User
 from django.contrib.postgres.lookups import Unaccent
 from django.db import transaction
@@ -425,7 +426,9 @@ def create(self, request: Request):
         identifier = None
         if 'identifier' in serializer.validated_data['metadata']:
             identifier = serializer.validated_data['metadata']['identifier']
-            identifier = identifier.removeprefix('DANDI:')
+            identifier = identifier.removeprefix(
+                f'{settings.DANDI_SCHEMA_INSTANCE_CONFIG.instance_name}:'
+            )
 
             try:
                 identifier = int(identifier)