Removed root processes

[Dashboy1998]

trafficstars

Context

• Continuation of #167
• Allows container to be ran with --user but still runs with PUID & GUID.

Choices

• Keeping the ability to still run as root as to not break anything.

Test instructions

[!IMPORTANT] You must set user to NUMBERICAL_UID:NUMBERICAL_GID To find your UID run id -u & to find your GID run id -g. In the examples they are listed as 1000:1000. If you wish to run it as a different UID/GID this can by done by changing the ownership: chown UID:GID palworld/ or by changing the permissions for all other: chmod o=rwx palworld/

1. Try to start the container as root:root, It should work
2. Try to start the container as root:steam, Given error
3. Try to start the container as steam:root, Given error
4. Start container with 1000:1000
5. Verify rcon-cli is working: docker exec palworld-server rcon-cli showplayers
6. Verify backup works: docker exec palworld-server backup
7. Verify no processes are running as root: docker exec -t palworld-server top -n 1
8. Verify supercronic is running: docker exec -t palworld-server bash -c "top -n 1 | grep --color supercronic"

Checklist before requesting a review

• [] I have performed a self-review of my code
• [x] I've added documentation about this change to the README.
• [x] I've not introduced breaking changes.