BUG: Lack of GUID/PUID/UMASK in env variables for Docker support (SOLUTION PROVIDED)

### Description

Many users run containers on Unraid systems, including myself. File permissions are pretty specific when volumes are mapped to the host. Every container running on an Unraid system must have PUIG/PGID and UMASK field support in the entrypoint script so that the correct file permissions can be set upon creation.

Unraid requires PUID/PGID to be set to 99:100 and a UMASK of 000 for containers to create files and access them after creation.

### Version

2.4.2

### Steps to Reproduce

Running current image does not have env vars to support these values. All files are created as 'root' user with limited permissions.

### List Links

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### Screenshots

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### Logs

```shell

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### Additional Context

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