### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### The Feature

Add the ability for LiteLLM to read secrets from a file, in a similar way to `os.environ/` so as to integrate with Docker's secrets, or other systems that manifest secrets as files

### Motivation, pitch

Some system's manifest secrets as files instead of env variables (e.g. Docker Compose's `secrets` key (Or legacy Swarm)), this is done to avoid exposing such secrets via introspection APIs like `docker inspect`. It would be nice to have a feature to have LiteLLM read a secret from a file for these.

### What part of LiteLLM is this about?

Proxy

### LiteLLM is hiring a founding backend engineer, are you interested in joining us and shipping to all our users?

No

### Twitter / LinkedIn details

_No response_