add environment variable configuration for Open WebUI to disable auth

[ilopezluna]

This pull request updates the environment variable handling for the Open WebUI container app to ensure authentication is disabled by default.

[sourcery-ai]

Hey - I've left some high level feedback:

• Hardcoding WEBUI_AUTH=false in openwebuiEnv removes any way to enable auth through this CLI; consider making this configurable (e.g., via a flag or environment variable) while still defaulting to false.
• Since openwebuiEnv just decorates openaiEnv(openaiPathSuffix), you could reduce duplication and keep behavior consistent by exposing a helper like openaiEnvWithAuthDisabled or by passing an options struct instead of hardcoding the extra WEBUI_AUTH entry in a separate function.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Hardcoding `WEBUI_AUTH=false` in `openwebuiEnv` removes any way to enable auth through this CLI; consider making this configurable (e.g., via a flag or environment variable) while still defaulting to `false`.
- Since `openwebuiEnv` just decorates `openaiEnv(openaiPathSuffix)`, you could reduce duplication and keep behavior consistent by exposing a helper like `openaiEnvWithAuthDisabled` or by passing an options struct instead of hardcoding the extra `WEBUI_AUTH` entry in a separate function.

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[gemini-code-assist]

Code Review

The pull request successfully introduces an environment variable configuration to disable authentication for Open WebUI by default. The changes correctly update the envFn for Open WebUI to use a new openwebuiEnv function, which appends WEBUI_AUTH=false. The accompanying tests adequately cover this new functionality and ensure the environment variable is correctly applied and reflected in configuration outputs.

[gemini-code-assist]

Setting WEBUI_AUTH=false by default significantly impacts the security posture of the Open WebUI application by disabling authentication. While this aligns with the pull request's objective, it's crucial to ensure that users are explicitly aware of this default behavior and its security implications, especially if the application is exposed to untrusted networks. Consider adding a prominent note in the documentation or CLI output when launching Open WebUI with this setting, advising users on how to re-enable authentication if needed for production environments.