Better secret error handling.

[squidarth]

TODO: Write integration tests

Summary

Currently, if you are missing secrets from your config file, you get this error:

Aug 09 2:11:07pm
Exception while loading model

Traceback (most recent call last):
  File "/app/model_wrapper.py", line 101, in load
    self.try_load()
  File "/app/model_wrapper.py", line 163, in try_load
    retry(
  File "/app/common/retry.py", line 20, in retry
    raise exc
  File "/app/common/retry.py", line 15, in retry
    fn()
  File "/app/model/model.py", line 21, in load
    "pyannote/speaker-diarization@2.1", use_auth_token=self._secrets["hf_access_token"]
  File "/app/shared/secrets_resolver.py", line 37, in __getitem__
    return SecretsResolver._resolve_secret(key, self._base_secrets[key])
KeyError: 'hf_access_token'

Similarly, if your secrets are not mounted, you will just get a silent failure and a None returned from secrets.get().

Fix

I propose fixing this by returning a new exception type with more information.