Add stack 2.3.1 to shell.nix

[smatting]

This adds the upstream static 2.3.1 build of stack to shell.nix.
I tested on linux that HLS from within shell.nix generates the same .cabal files as stack 2.3.1.

[jmatsushita]

The principle works on OSX! Very nice. Except I have a forked shell.nix which includes the stack-deps.nix:

let
  sources = import ./nix/sources.nix;

  pkgs = import sources.nixpkgs { 
    overlays = [
      (import ./nix/overlays/wire-server.nix)
    ];
  };

  stack = with pkgs; stdenv.mkDerivation {
      pname = "stack";
      version = "2.3.1";

      
      src =
        if stdenv.isDarwin
        then fetchurl {
          url = "https://github.com/commercialhaskell/stack/releases/download/v2.3.1/stack-2.3.1-osx-x86_64.tar.gz";
          sha256 = "089nrb8mxf76a0r0hdccaxfvx1ly24b5zc0cy05gs4adybjygvkk";
        }
        else fetchurl {
          url = "https://github.com/commercialhaskell/stack/releases/download/v2.3.1/stack-2.3.1-linux-x86_64-static.tar.gz";
          sha256 = "0iqfqcd88rvlwgm2h8avs0rsi9f3pdxilvcacgrxskb1n8q8ibjb";
        };

      installPhase = ''
        mkdir -p $out/bin
        cp stack $out/bin
      '';
  };

in
with pkgs;
pkgs.mkShell {
  name = "shell";

  nativeBuildInputs = lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
    Cocoa
    CoreServices
  ]);

  buildInputs = (with pkgs; [
    cryptobox
    geoip
    git
    icu
    libsodium
    libxml2
    ncurses
    openssl
    pkgconfig
    protobuf
    pcre
    snappy
    zlib
    lzma
    docker-compose
    gnumake
    libiconv # Should make this Darwin only?
    haskell-language-server
  ]) ++ [ stack ] ;
   
  ghc = pkgs.haskell.compiler.ghc884;

}

[fisx]

@jmatsushita I'm not sure you're suggesting changes, but I think either way this is good to merge (you can always add changes later). yell if you disagree. :)