Check that stack builds (#1737)

Author: hamishmack

build.nix

@@ -25,6 +25,7 @@ in rec {
   tools = pkgs.lib.optionalAttrs (ifdLevel >= 3) (
     pkgs.recurseIntoAttrs ({
       cabal-latest = tool compiler-nix-name "cabal" { inherit evalPackages; };
+      stack = tool compiler-nix-name "stack" { version = "2.9.1"; inherit evalPackages; };
       hlint-latest = tool compiler-nix-name "hlint" {
         inherit evalPackages;
         version = {