add overlay

flake.nix

@@ -7,6 +7,7 @@
     let
       exports = {
         nixosModules.age = import ./modules/age.nix;
+        overlay = import ./overlay.nix;
       };
       outputs = flake-utils.lib.eachDefaultSystem (system: {
         packages = nixpkgs.legacyPackages.${system}.callPackage ./default.nix { };

overlay.nix

@@ -0,0 +1,5 @@
+final: prev:
+{
+  agenix = prev.callPackage ./pkgs/agenix.nix { };
+  rage = pkgs.callPackage ./pkgs/rage.nix  {};
+}