mypy fails due to SimpleJWT trying to access SECRET_KEY

[PureTryOut]

Currently our CI is failing due to mypy failing to find SECRET_KEY as used by SimpleJWT.

$ mypy . --check-untyped-defs
Traceback (most recent call last):
Error constructing plugin instance of NewSemanalDjangoPlugin
  File "/home/runner/work/beep-backend/beep-backend/.venv/bin/mypy", line 8, in <module>
    sys.exit(console_entry())
             ^^^^^^^^^^^^^^^
  File "/home/runner/work/beep-backend/beep-backend/.venv/lib/python3.11/site-packages/mypy/__main__.py", line 15, in console_entry
    main()
  File "mypy/main.py", line 95, in main
  File "mypy/main.py", line 174, in run_build
  File "mypy/build.py", line 197, in build
  File "mypy/build.py", line 242, in _build
  File "mypy/build.py", line 503, in load_plugins
  File "mypy/build.py", line 484, in load_plugins_from_config
  File "/home/runner/work/beep-backend/beep-backend/.venv/lib/python3.11/site-packages/mypy_django_plugin/main.py", line 77, in __init__
    self.django_context = DjangoContext(self.plugin_config.django_settings_module)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/beep-backend/beep-backend/.venv/lib/python3.11/site-packages/mypy_django_plugin/django/context.py", line 84, in __init__
    apps, settings = initialize_django(self.django_settings_module)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/beep-backend/beep-backend/.venv/lib/python3.11/site-packages/mypy_django_plugin/django/context.py", line 68, in initialize_django
    apps.populate(settings.INSTALLED_APPS)
  File "/home/runner/work/beep-backend/beep-backend/.venv/lib/python3.11/site-packages/django/apps/registry.py", line 116, in populate
    app_config.import_models()
  File "/home/runner/work/beep-backend/beep-backend/.venv/lib/python3.11/site-packages/django/apps/config.py", line 269, in import_models
    self.models_module = import_module(models_module_name)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.4/x64/lib/python3.11/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1204, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1176, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1147, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 690, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 940, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/home/runner/work/beep-backend/beep-backend/.venv/lib/python3.11/site-packages/rest_framework_simplejwt/models.py", line 6, in <module>
    from .settings import api_settings
  File "/home/runner/work/beep-backend/beep-backend/.venv/lib/python3.11/site-packages/rest_framework_simplejwt/settings.py", line 19, in <module>
    "SIGNING_KEY": settings.SECRET_KEY,
                   ^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/beep-backend/beep-backend/.venv/lib/python3.11/site-packages/django/conf/__init__.py", line 111, in __getattr__
    raise ImproperlyConfigured("The SECRET_KEY setting must not be empty.")

django.core.exceptions.ImproperlyConfigured: The SECRET_KEY setting must not be empty.

Strangely, this doesn't happen if I run mypy locally, only in CI where setup is basically the same. I tried running DJANGO_SETTINGS_MODULE=<path to settings> mypy . but it did not work. How can I get this package compatible with mypy?