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Updated RAG /config and /config/update endpoints to support UI updates.

Fixed .dockerignore to prevent Python venv from being copied into Docker image.

Added persistent configuration options to configure use and location of Tika service.

Updated backend.apps.rag.main:get_loader() to make use of Tika document loader.

Renamed RAG_WEB_SEARCH_WHITE_LIST_DOMAINS to RAG_WEB_SEARCH_DOMAIN_FILTER_LIST

this commit adds an optional environment variable named `WEBUI_AUTH_TRUSTED_NAME_HEADER`, which sets the user's name to the contents of that header. this only happens if the user is just being created, just like how the trusted e-mail header works.

if the environment variable or header is not present, we fall back to the original behavior which is to re-use the user e-mail address.
Co-Authored-By: Nikita Borzykh <sample@fastmail.com>

this commit adds four environment variables:

- COMFYUI_CFG_SCALE
- COMFYUI_SAMPLER
- COMFYUI_SCHEDULER
- COMFYUI_SD3 (merely setting this at all will enable SD3 mode)