[CI/CD] Linux builds being built with too new version causing issue with startup on EX: Debian 12

[nullsystem]

Build Info

v12.0-prealpha

Description

We should be trying to use the "Steam runtime Sniper 3.0" container to build for Linux instead of Ubuntu 24.04: https://gitlab.steamos.cloud/steamrt/steamrt/-/blob/steamrt/sniper/README.md if it's possible to use that in the GitHub actions workflow. It's even what Valve stipulate what Linux builds should be built upon.

Relevant info to use the sniper container? https://docs.github.com/en/actions/writing-workflows/choosing-where-your-workflow-runs/running-jobs-in-a-container

To Reproduce

1. Use EX: Debian 12
2. Binaries fails to run due to being compiled to newer C++ system libraries

Expected behavior

It works on at least Debian 12/whatever the Steam sniper 3.0 supports.

Actual behavior

It does not work on at least Debian 12/whatever the Steam sniper 3.0 supports.

Operating System

• Windows
• Linux

Version/Distro

Linux

Machine's CPU

No response

Machine's GPU

No response

GPU's driver

No response

Build's compiler

No response

Additional context and Screenshots

No response