Added overlays to the flake\nIt seems to be needed for the package …

…to be accessable in NixOS

flake.nix

@@ -13,16 +13,17 @@
       let
         pkgs = import nixpkgs { inherit system; };
         naersk-lib = pkgs.callPackage naersk { };
-      in
-      {
-        packages.default = naersk-lib.buildPackage {
-            buildInputs = with pkgs; [ gnupg ssh-copy-id ];
-            src = ./.;
-        };
+
+      in {
+        packages.default = pkgs.callPackage ./package.nix { inherit naersk-lib; };
         devShell = with pkgs; mkShell {
           buildInputs = [ cargo rustc rustfmt pre-commit rustPackages.clippy ];
           RUST_SRC_PATH = rustPlatform.rustLibSrc;
         };
       }
-    );
+    ) // {
+      overlays.default = final: prev: {
+        gpg-ssh = final.callPackage ./package.nix { naersk-lib = (final.callPackage naersk { }); };
+      };
+    };
 }

package.nix

@@ -0,0 +1,8 @@
+{ naersk-lib
+, gnupg
+, ssh-copy-id
+}:
+naersk-lib.buildPackage {
+  buildInputs = [ gnupg ssh-copy-id ];
+  src = ./.;
+}