models.Owner.DoesNotExist: Owner matching query does not exist.

When login with github callback, I got a error:

{"error": "Server Error (500)"}

In api container, it raises an error:

{
  "message": "Internal Server Error: /login/github",
  "asctime": "2024-12-18 14:52:45,187",
  "name": "django.request",
  "levelname": "ERROR",
  "lineno": 241,
  "pathname": "/usr/local/lib/python3.12/site-packages/django/utils/log.py",
  "funcName": "log_response",
  "threadName": "MainThread",
  "exc_info": "xxxx",
  "taskName": null,
  "status_code": 500,
  "request": "<WSGIRequest: GET '/login/github?code=xx&state=xx'>",
  "utctime": "2024-12-18T14:52:45.187000",
  "logger.name": "django.request",
  "logger.thread_name": "MainThread",
  "level": "ERROR"
}

The exc_info details:

Traceback (most recent call last):
  File \"/usr/local/lib/python3.12/site-packages/django/db/models/query.py\", line 916, in get_or_create
    return self.get(**kwargs), False
           ^^^^^^^^^^^^^^^^^^
  File \"/usr/local/lib/python3.12/site-packages/django/db/models/query.py\", line 637, in get
    raise self.model.DoesNotExist(
shared.django_apps.codecov_auth.models.Owner.DoesNotExist: Owner matching query does not exist.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File \"/usr/local/lib/python3.12/site-packages/django/core/handlers/exception.py\", line 55, in inner
    response = get_response(request)
               ^^^^^^^^^^^^^^^^^^^^^
  File \"/usr/local/lib/python3.12/site-packages/django/core/handlers/base.py\", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/usr/local/lib/python3.12/site-packages/django/views/generic/base.py\", line 104, in view
    return self.dispatch(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/usr/local/lib/python3.12/site-packages/django/views/generic/base.py\", line 143, in dispatch
    return handler(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/app/codecov_auth/views/github.py\", line 139, in get
    return self.actual_login_step(request)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/app/codecov_auth/views/github.py\", line 122, in actual_login_step
    owner = self.get_and_modify_owner(user_dict, request)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/app/codecov_auth/views/base.py\", line 268, in get_and_modify_owner
    owner, is_new_user = self._get_or_create_owner(user_dict, request)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/app/codecov_auth/views/base.py\", line 363, in _get_or_create_owner
    owner, was_created = Owner.objects.get_or_create(
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/usr/local/lib/python3.12/site-packages/django/db/models/manager.py\", line 87, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/usr/local/lib/python3.12/site-packages/django/db/models/query.py\", line 923, in get_or_create
    return self.create(**params), True
           ^^^^^^^^^^^^^^^^^^^^^
  File \"/usr/local/lib/python3.12/site-packages/django/db/models/query.py\", line 658, in create
    obj.save(force_insert=True, using=self.db)
  File \"/usr/local/lib/python3.12/site-packages/shared/django_apps/codecov_auth/models.py\", line 395, in save
    super().save(*args, **kwargs)
  File \"/usr/local/lib/python3.12/site-packages/django/db/models/base.py\", line 814, in save
    self.save_base(
  File \"/usr/local/lib/python3.12/site-packages/model_utils/tracker.py\", line 343, in inner
    return original(instance, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/usr/local/lib/python3.12/site-packages/django/db/models/base.py\", line 892, in save_base
    post_save.send(
  File \"/usr/local/lib/python3.12/site-packages/django/dispatch/dispatcher.py\", line 177, in send
    (receiver, receiver(signal=self, sender=sender, **named))
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/app/codecov_auth/signals.py\", line 53, in update_owner
    ShelterPubsub.get_instance().publish(data)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/app/utils/shelter.py\", line 22, in get_instance
    cls._instance = cls()
                    ^^^^^
  File \"/app/utils/shelter.py\", line 27, in __init__
    self.pubsub_publisher = pubsub_v1.PublisherClient()
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File \"/usr/local/lib/python3.12/site-packages/google/cloud/pubsub_v1/publisher/client.py\", line 139, in __init__
    super().__init__(**kwargs)
  File \"/usr/local/lib/python3.12/site-packages/google/pubsub_v1/services/publisher/client.py\", line 492, in __init__
    self._transport = Transport(
                      ^^^^^^^^^^
  File \"/usr/local/lib/python3.12/site-packages/google/pubsub_v1/services/publisher/transports/grpc.py\", line 153, in __init__
    super().__init__(
  File \"/usr/local/lib/python3.12/site-packages/google/pubsub_v1/services/publisher/transports/base.py\", line 104, in __init__
    credentials, _ = google.auth.default(
                     ^^^^^^^^^^^^^^^^^^^^
  File \"/usr/local/lib/python3.12/site-packages/google/auth/_default.py\", line 697, in default
    raise exceptions.DefaultCredentialsError(_CLOUD_SDK_MISSING_CREDENTIALS)
google.auth.exceptions.DefaultCredentialsError: Your default credentials were not found. To set up Application Default Credentials, see https://cloud.google.com/docs/authentication/external/set-up-adc for more information.

How can I fix this ?

Start with app/codecov_auth/views/github.py and app/codecov_auth/views/base.py to trace the callback into owner creation, then read app/codecov_auth/signals.py and app/utils/shelter.py where the traceback reaches Pub/Sub client initialization. Reproduce the GitHub callback with the documented local configuration and verify it no longer returns a 500 when the required credentials are available.