Add a Nix flake for building and installing Wallr

[TheCodedKid]

Hi! Would you be open to a contribution adding a Nix flake to Wallr?

The goal would be to let Nix and NixOS users build, install, and develop Wallr with commands such as:

nix build
nix run
nix develop

I would plan to add:

• A reproducible Wallr package with the required Rust, Wayland, and FFmpeg dependencies
• A development shell
• Flake outputs for the supported systems
• A short Nix installation section in the README

Is this something you would be interested in accepting? If so, are there any preferred conventions?

Cool project btw : ]

[programmersd21]

hmm ok lemme try it soon :) I'm on vacation so expect around 9 to 11 September for the solution :)

[programmersd21]

oops I closed it lemme reopen it

[programmersd21]

done

[TheCodedKid]

done

You are a real one, thank you