Use Package not Application

deploy/flake.nix

@@ -4,7 +4,7 @@
 
   outputs = { self, nixpkgs, handyhelper }: let
     system = "x86_64-linux";
-    handy_py = handyhelper.packages.${system}.handyhelper;
+    handy_py = handyhelper.packages.${system}.handyhelper_pkg;
   in {
     nixosConfigurations."staging" = nixpkgs.lib.nixosSystem {
       inherit system;

flake.nix

@@ -11,8 +11,7 @@
   outputs = { self, nixpkgs, flake-utils, poetry2nix }:
     flake-utils.lib.eachDefaultSystem (system:
       let
-        # see https://github.com/nix-community/poetry2nix/tree/master#api for more functions and examples.
-        inherit (poetry2nix.legacyPackages.${system}) mkPoetryApplication mkPoetryEnv;
+        inherit (poetry2nix.legacyPackages.${system}) mkPoetryApplication mkPoetryEnv mkPoetryPackages;
         pkgs = nixpkgs.legacyPackages.${system};
       in rec {
 
@@ -23,7 +22,7 @@
 
               handyhelper = pkgs.runCommand "Handy Helper Deploy" {
                 nativeBuildInputs = [
-                  packages.handyhelper
+                  packages.handyhelper_pkg
                 ];
               } ''
                 cat << 'DOC' >> $out
@@ -44,8 +43,10 @@ DOC
               '';
             };
           };
+        
         packages = {
           handyhelper = mkPoetryApplication { projectDir = self; };
+          handyhelper_pkg = mkPoetryPackages { projectDir = self; };
           default = self.packages.${system}.handyhelper;
         };