tests/e2e: ensure outpost service account has correct permissions

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

tests/e2e/test_provider_proxy.py

@@ -86,6 +86,7 @@ class TestProviderProxy(SeleniumTestCase):
         )
         outpost.providers.add(proxy)
         outpost.save()
+        _ = outpost.user
 
         self.proxy_container = self.start_proxy(outpost)
 
@@ -145,6 +146,7 @@ class TestProviderProxyConnect(ChannelsLiveServerTestCase):
         )
         outpost.providers.add(proxy)
         outpost.save()
+        _ = outpost.user
 
         # Wait until outpost healthcheck succeeds
         healthcheck_retries = 0