Site access updates (#6731)

* Throw error on invalid site access policy

- If ALLOWED_HOSTS is empty, exit
- If CSRF_TRUSTED_ORIGINS is empty, exit
- Closes https://github.com/inventree/InvenTree/issues/6730

* Set parameters for devcontainer

* Update documentation

* Ignore server exit in testing mode

* Add INVENTREE_SITE_URL to CI

* Further CI updates

* Update settings.py

* Unit test updates

* More unit test updates

* Bump API version

* Re-introduce checks in settings.py

- Allow more lenient behaviour in TESTING mode

.github/workflows/translations.yml

@@ -22,6 +22,7 @@ jobs:
       INVENTREE_MEDIA_ROOT: ./media
       INVENTREE_STATIC_ROOT: ./static
       INVENTREE_BACKUP_DIR: ./backup
+      INVENTREE_SITE_URL: http://localhost:8000
 
     steps:
       - name: Checkout Code