testing: add shims to mock authentication locally (Bug 1978881)

[cgsheeh]

Add a MockAuthBackend which overrides authenticate to always
return a mocked local user. Add a MockAuthMiddleware to log the
user in to a session.

With these shims loaded, running Lando locally with docker compose
will show an authenticated view.

[cgsheeh]

@zzzeid @shtrom posting this as a draft so we can discuss the best approach for using this in the repo. Test failures are expected since it's currently loading into the main settings.py file.

My initial thought is we should add this in a separate settings.py file, and have that file load via an environment variable or CLI argument when starting Lando. Any other ideas are appreciated.

[zzzeid]

@zzzeid @shtrom posting this as a draft so we can discuss the best approach for using this in the repo. Test failures are expected since it's currently loading into the main settings.py file.

My initial thought is we should add this in a separate settings.py file, and have that file load via an environment variable or CLI argument when starting Lando. Any other ideas are appreciated.

Initial thoughts:

• I am not sure we should unconditionally authenticate users, this would at least break invalid auth workflows (e.g., providing an incorrect user/password), and seems like way more than what is needed for local testing.
• I think rather than creating a separate auth backend, adding a script that creates test users locally along with their required permissions would be better and more streamlined. There already is an auth backend that allows logging in with a user/password, so this can be used instead, and we already create an admin user in this way.

Aside from the comments above:

My initial thought is we should add this in a separate settings.py file, and have that file load via an environment variable or CLI argument when starting Lando. Any other ideas are appreciated.

See implementation of test_settings.py and remote_settings.py which could be used in a similar way for local_settings.py.