Implement auto-update script

[soonic6]

My Usecase:
I use prefill every night to pre fill my lancache. A cronjob starts up an LXC, runs an update script, runs the prefill and shut the LXC down.

Motivation:
A version check is still implemented, but a quiet (maybe optional) autoupdate can be usefull for a headless lancache-prefill.

Maybe https://github.com/soonic6/steam-lancache-prefill-update could be implemented for auto-updates.

[tpill90]

Implementation Tasks

• Scripts
  • Implement Bash based update script. https://github.com/tpill90/steam-lancache-prefill/blob/master/scripts/update.sh
  • Implement Powershell based update script, for Windows. https://github.com/tpill90/steam-lancache-prefill/blob/master/scripts/update.ps1
• Publish
  • Include update.sh in Linux, OSX, and ARM publish package
  • Include update.ps1 in Windows publish package
• Documentation
  • Reference new update scripts in Updating section in readme https://github.com/tpill90/steam-lancache-prefill#updating

[ich777]

@tpill90 from the script that @soonic6 posted you can also hand over the current path from prefill directly to the script if that's something from interest, this is basically a install/update script on it's own.

[tpill90]

[tpill90]

Released in v1.6.0