feat(backup): add parallel backup creation using pigz

[MicLieg]

Description

This pull request changes the creation of a backup to use pigz to reduce compression times by parallelizing compression. To do that pigz was added to the dependencies.

Backup times on i7-13700K bare metal server

Default Backup

Small Minecraft Server (117 MB) took ~ 5 seconds

user@hostmachine:~/minecraft$ time ./mcserver backup
[ INFO ] Backing up mcserver: Starting backup: No previous backups found
[  OK  ] Backing up mcserver: Completed: mcserver-2024-02-25-163835.tar.gz, total size 107M
core_exit.sh exiting with code: 4

real    0m5,122s

Big Minecraft Server (18 GB) took ~ 285 seconds

user@hostmachine:~/minecraft$ time ./mcserver backup
[ INFO ] Backing up mcserver: Starting backup: No previous backups found
[  OK  ] Backing up mcserver: Completed: mcserver-2024-02-25-165601.tar.gz, total size 15G
core_exit.sh exiting with code: 4

real    4m44,821s

Parallel Backup

Small Minecraft Server (117 MB) took ~ 3 seconds

user@hostmachine:~/minecraft$ time ./mcserver backup
[ INFO ] Backing up mcserver: Starting backup: No previous backups found
[  OK  ] Backing up mcserver: Completed: mcserver-2024-02-25-164608.tar.gz, total size 107M
core_exit.sh exiting with code: 4

real    0m3,197s

Big Minecraft Server (18 GB) took ~ 23 seconds

user@hostmachine:~/minecraft$ time ./mcserver backup
[ INFO ] Backing up mcserver: Starting backup: No previous backups found
[  OK  ] Backing up mcserver: Completed: mcserver-2024-02-25-170138.tar.gz, total size 15G
core_exit.sh exiting with code: 4

real    0m23,154s

Fixes #3422

Type of change

• Bug fix (a change which fixes an issue).
• New feature (a change which adds functionality).
• New Server (new server added).
• Refactor (restructures existing code).
• Comment update (typo, spelling, explanation, examples, etc).

Checklist

PR will not be merged until all steps are complete.

• This pull request links to an issue.
• This pull request uses the develop branch as its base.
• This pull request subject follows the Conventional Commits standard.
• This code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have checked that this code is commented where required.
• I have provided a detailed enough description of this PR.
• I have checked if documentation needs updating.

Documentation

If documentation does need updating either update it by creating a PR (preferred) or request a documentation update.

• User docs: https://github.com/GameServerManagers/LinuxGSM-Docs
• Dev docs: https://github.com/GameServerManagers/LinuxGSM-Dev-Docs

Thank you for your Pull Request!

[MicLieg]

To improve this, a new setting for the backupmode="fast" / "slow" could be added in the _default.cfg file to configure whether the slower, resource-saving or the faster backup mode should be used; which can easily cause 100% CPU utilisation on all cores.

[dgibbs64]

Looks good to me.