Add Python2.7 to Permittedinsecurepackages

flake.nix

@@ -13,6 +13,9 @@
       pkgs = import nixpkgs {
         inherit system;
         config.allowAliases = false;
+        config.permittedInsecurePackages = [
+          "python-2.7.18.6-env"
+        ];
         overlays = [ self.overlays.default ];
       };
       inherit (pkgs) lib;