use cleanSourceWith

Author: walkah

flake.nix

@@ -16,11 +16,11 @@
             # This overlay adds our project to pkgs
             fission =
               final.haskell-nix.project' {
-                # src = pkgs.haskell-nix.haskellLib.cleanGit { name = "fission"; src = ./.; };
-                src = ./.;
+                src = pkgs.haskell-nix.haskellLib.cleanSourceWith { name = "fission"; src = ./.; };
                 compiler-nix-name = "ghc8107";
                 stack-sha256 = "029kzhvljx3x13ngmb1mvf4ljf75l3ngnj95n3gxmbj7a211xs3c";
                 materialized = ./nix/materialized;
+
                 # NOTE: Currently handling devShells separately from haskell.nix
                 #
                 # shell.tools = {