0. environment

We will use nix to manage the shell environment. The shell.nix file:

let
  pkgs = import <nixpkgs> { };
in
pkgs.mkShell {
  buildInputs = with pkgs; [
    trunk
    cargo
    rustup
  ];

  LIBRARY_PATH = builtins.getEnv "LIBRARY_PATH" + ":/opt/homebrew/lib:/opt/homebrew/opt/libiconv/lib";
}