GitLab

* auth: fix problems with the ollama keypairs

This change adds several fixes including:
  - reading in the pubkey files correctly
  - fixing the push unit test to create a keypair file in a temp directory
  - not return 500 errors for normal status error

- return descriptive error messages when unauthorized to create blob or push a model
- display the local public key associated with the request that was denied

A few obvious levels were adjusted, but generally everything mapped to "info" level.