Added pkgsForCtl to perSystem _module.args

Author: jared

pkgs.nix

@@ -8,6 +8,19 @@
         inherit system;
       };
 
+      # TODO(bladyjoker): If we use recent nixpkgs we get: `error: nodejs_14 has been removed as it is EOL`. That's why we use CTL's old nixpkgs.
+      pkgsForCtl = import inputs.ctl.inputs.nixpkgs {
+        inherit system;
+        inherit (inputs.haskell-nix) config;
+        overlays = [
+          inputs.haskell-nix.overlay
+          inputs.iohk-nix.overlays.crypto
+          inputs.iohk-nix.overlays.haskell-nix-crypto
+          inputs.ctl.overlays.purescript
+          inputs.ctl.overlays.spago
+        ];
+      };
+
       # TODO(bladyjoker): haskell.nix is brittle on its nixpkgs, and tends to break stuff for us, so we instantiate haskell.nix nixpkgs specifically. For example https://github.com/Plutonomicon/plutarch-plutus/pull/624
       pkgsForHaskellNix = import inputs.haskell-nix.inputs.nixpkgs {
         inherit system;