[FEAT] Add Custom Whisper Models Addon

[Mad-Jam]

Is this a new feature request?

• I have searched the existing issues

Wanted change

Add support for custom Whisper models (e.g., kb-whisper) via an environment variable like WHISPER_MODEL. This would allow users to specify and use non-English or specialized models.

Reason for change

Non-English languages often need larger or language-specific models for better accuracy.

Proposed code change

No response

[github-actions]

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[Mad-Jam]

Tried to add 'KBLab/kb-whisper-medium' to environment 'WHISPER_MODEL' (docker, CPU only). It just worked.
A comment in README.MD that other whisper models from Hugging Face can work.

[LinuxServer-CI]

This issue has been automatically marked as stale because it has not had recent activity. This might be due to missing feedback from OP. It will be closed if no further activity occurs. Thank you for your contributions.

[LinuxServer-CI]

This issue is locked due to inactivity