Native linux build available now!

I've been working on setting up build pipelines for various releases of this game (so that I can hopefully copy+paste them into future games!). This Linux build is one of the first to be done, and should hopefully work on Steam Deck! I'll be working on trying to get a Windows build done next, and then I'll automate the WebAssembly build so that updates can be automatically pushed out to all platforms at once.