Nginx: disable open_file_cache if media is on NFS

[leccelecce]

Proposed change

This change disables nginx's open_file_cache if the /media/frigate/clips directory is detected to be an NFS mount.

#17118 (reply in thread)

Above comment covers the investigation into this in more details; TLDR = the creator of nginx says don't use open_file_cache with NFS mounts due to the filesystem not properly observing unix file semantics: https://trac.nginx.org/nginx/ticket/478

The nginx ticket is from 2014, but seeing as I see an issue without the fix, and it goes away with the fix, fair to assume it's still valid.

I have tested this locally in my devcontainer (non-NFS) and my test instance (NFSv4) and it seems to work fine. I don't observe any performance degradation browsing around the UI. Once betas start and a broader user-base is testing this, happy to look into any performance concerns.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code
• Documentation Update

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• UI changes including text have used i18n keys and have been added to the en locale.
• The code has been formatted using Ruff (ruff format frigate)

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