flake: fix build for multiple target systems

flake.lock

@@ -0,0 +1,58 @@
+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1717285511,
+        "narHash": "sha256-iKzJcpdXih14qYVcZ9QC9XuZYnPc6T8YImb6dX166kw=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "2a55567fcf15b1b1c7ed712a2c6fadaec7412ea8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1718229064,
+        "narHash": "sha256-ZFav8A9zPNfjZg/wrxh1uZeMJHELRfRgFP+meq01XYk=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "5c2ec3a5c2ee9909904f860dadc19bc12cd9cc44",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-23.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1717284937,
+        "narHash": "sha256-lIbdfCsf8LMFloheeE6N31+BMIeixqyQWbSr2vk79EQ=",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/eb9ceca17df2ea50a250b6b27f7bf6ab0186f198.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/eb9ceca17df2ea50a250b6b27f7bf6ab0186f198.tar.gz"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -15,6 +15,9 @@
       systems = [ "x86_64-linux" "aarch64-linux" ];
 
       perSystem = args@{ system, pkgs, lib, config, ... }: let
+        overlayAttrs = {
+          inherit (config.packages) invoiceplane-template;
+        };
         invoiceplane-template = pkgs.stdenv.mkDerivation {
           name = "invoiceplane-template";
           src = ./.;
@@ -25,10 +28,6 @@
         };
       in {
         packages.default = invoiceplane-template;
-        packages.invoiceplane-template = invoiceplane-template;
-        overlayAttrs = {
-          inherit (config.packages) invoiceplane-template;
-        };
       };
     };
 }