Package linux builds

[ReplayCoding]

Implementation

This PR implements support for packaging linux builds. A github action has also been added to compile builds on push.

TODO:

• currently this can't be used on windows, since the platform is hardcoded in game_clean/shared.sh
• the windows part of game_clean/copy.sh has not been tested.
• itch.io package files

Checklist

• No other PRs implement this idea.
• This PR does not introduce any regressions.
• I certify that this PR is my own entirely original work, or I have permission from and have attributed the relevant authors.
• I have agreed to and signed this project's Contributor License Agreement.
• This PR targets the tc2-mod branch.

• This change has been filed as an issue.
• No other PRs address this.
• This PR is as minimal as possible.
• This PR does not introduce any regressions.
• This PR has been built and locally tested on at least one platform.
• This PR has been tested on all platforms, on both a dedicated server and on a listen server.

Testing Checklist

	Client	Server	Version
Windows
Linux	Built & Tested		6.6.75 #1-NixOS SMP PREEMPT_DYNAMIC Sat Feb 1 17:37:57 UTC 2025

Caveats

Alternatives

Don't distribute linux builds

[mastercoms]

Integrated some scripts for cross platform: ca33745