Update ci.yaml

Specify INVENTREE_SITE_URL

Author: SchrodingersGat

.github/workflows/ci.yaml

@@ -8,6 +8,7 @@ jobs:
 
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      INVENTREE_SITE_URL: http://127.0.0.1:12345
       INVENTREE_DB_ENGINE: django.db.backends.sqlite3
       INVENTREE_DB_NAME: ../inventree_unit_test_db.sqlite3
       INVENTREE_MEDIA_ROOT: ../test_inventree_media