Minimize Root Processes

[Dashboy1998]

Context

• Currently you start the container as root and during the start up process everything is ran as root except the command with su.
  

• Currently when backups are created they are created and owned by root however on next boot the permission is changed to steam:steam

• When starting with a PUID or PGID that is not 1000 you get the following error: /tmp/dumps is not owned by us - delete and recreate

palworld-server-test  | *****STARTING INSTALL/UPDATE*****
palworld-server-test  | tid(22) burning pthread_key_t == 0 so we never use it
palworld-server-test  | Redirecting stderr to '/home/steam/Steam/logs/stderr.txt'
palworld-server-test  | Logging directory: '/home/steam/Steam/logs'
palworld-server-test  | /tmp/dumps is not owned by us - delete and recreate
palworld-server-test  | [  0%] Checking for available updates..

• Currently When starting with a PGID that is not 1000 then /home/steam/ has the group 1000 instead of steam.

Choices

• Overall trying to reduce having to run as root.
• Moved all commands which needed su to start.sh
• Other commands in start.sh should be ran as steam anyways
• Everything in start.sh should only need to be ran as steam user

Test instructions

Unless explicitly stated your PUID or PGID should not be 0 for testing

1. Start container with a PGID that is neither 0 or 1000
   1. verify you do not get this error: /tmp/dumps is not owned by us - delete and recreate
   2. verify /home/steam is owned by steam:steam: docker exec palworld-server bash -c "ls -ll /home/steam"
2. After the server has finished booting use top to verify the only processes running as root are init.sh, su, and top: docker exec -t palworld-server top
3. Run a backup as root and verify that the file is owned by steam:steam: docker exec palworld-server bash -c "backup && ls -l /palworld/backups/"
4. Run a backup as steam and verify that the file is owned by steam:steam: docker exec -u steam palworld-server bash -c "backup && ls -l /palworld/backups/"
5. Test rcon-cli as root: docker exec -it palworld-server-test rcon-cli
6. Test rcon-cli as steam: docker exec -it -u steam palworld-server-test rcon-cli
7. Verify you don't get this message /tmp/dumps is not owned by us - delete and recreate when:
   1. Start container with a PGID that is 0
   2. Start container with a PUID that is 0
   3. Start container with a PUID & PGID that is 0
8. Verify you still get this message Running as root is not supported, please fix your PUID and PGID! when:
   1. Start container with a PGID that is 0
   2. Start container with a PUID that is 0
   3. Start container with a PUID & PGID that is 0

Checklist before requesting a review

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

[thijsvanloef]

I've tested it, and everything works fine, however this is a big PR that I would also like a second opinion on. Posting this in the discord, hopefully someone else would be able to look at it.

Once again thank you for all the contributions :D

[MSpreckels]

LGTM

Maybe eventually we can go for non root when we run steam non root (if that is even possible)