[FEAT] Set `nice`ness

[Anuskuss]

Is this a new feature request?

• I have searched the existing issues

Wanted change

My encodes usually take a few days so I like to run them detached and with high niceness. I could use renice but I'm sure I won't remember to do that every time so I'd like to have an environment variable where I can hardcode this instead.

Reason for change

Prevent ffmpeg from taking all CPU for itself.

Proposed code change

No response

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[LinuxServer-CI]

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