[db] use tcp -> support ssh

uncloud_django_based/uncloud/uncloud/settings.py

@@ -27,6 +27,7 @@ except ModuleNotFoundError:
     DATABASES = {
         'default': {
             'ENGINE': 'django.db.backends.postgresql',
+            'HOST': '::1', # connecting via tcp, v6, to allow ssh forwarding to work
             'NAME': uncloud.secrets.POSTGRESQL_DB_NAME,
         }
     }