ci: add DJANGO_DANDI_INSTANCE_NAME env var to frontend CI

Author: candleindark

.github/workflows/frontend-ci.yml

@@ -76,6 +76,7 @@ jobs:
       DJANGO_DANDI_WEB_APP_URL: http://localhost:8085
       DJANGO_DANDI_API_URL: http://localhost:8000
       DJANGO_DANDI_JUPYTERHUB_URL: https://hub.dandiarchive.org/
+      DJANGO_DANDI_INSTANCE_NAME: DANDI
 
       # Web client env vars
       VITE_APP_DANDI_API_ROOT: http://localhost:8000/api/