Cron update

[Luatan]

Context

• adds a Cronjob to check for updates
• Cronjob can be set like the backup cronjob from @Dashboy1998
• Addressing check for available updates automatically #38

Choices

• using the steamapi to get the current build and compare it to the buildId in the file palworld\steamapps\appmanifest_2394010.acf. I am not sure it that is the best way to check. Maybe you have input on this.
• to "update" the server, the script will broadcast a message to the players and restart the server in x minutes. This will only work if the env UPDATE_ON_BOOT is set.
• I have set the default cron expression to once per hour and the warning minutes to 30 minutes

Test instructions

1. Set UPDATE_CRON_EXPRESSION to * * * *
2. Set WARN_MINUTES to 1
3. check in the log that the cronjob is running correctly
4. (Optional) login to the server and create a character
5. change the buildId on line 11 in the file `palworld\steamapps\appmanifest_2394010.acf`` to any other value (for example 13289561)
6. Verify that the server restarts in one Minute after the cronjob has started

A Real world test is still needed

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.

[Dashboy1998]

Works for me.

[Luatan]

Works for me.

thank you for the review and fixing my bad code. Great Input, you're a legend 💯

[Dashboy1998]

Works for me.

thank you for the review and fixing my bad code. Great Input, you're a legend 💯

You're code was pretty good already. I just pointed out a few typos and mentioned a few edge cases.

[thijsvanloef]

@Luatan thanks for your work!

[thijsvanloef]

@Luatan Some linting errors remain, if they are solved, will merge and add to next release :)

[thijsvanloef]

@Luatan Tested it locally ran into no issues, thank you for your amazing work, merging :)