add flake-parts

flake.nix

@@ -4,6 +4,10 @@
       url = "github:ryantm/agenix";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    flake-parts = {
+      url = "github:hercules-ci/flake-parts";
+      inputs.nixpkgs-lib.follows = "nixpkgs";
+    };
     home-manager = {
       url = "github:nix-community/home-manager";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -21,10 +25,12 @@
     nur = {
       url = "github:nix-community/NUR";
       inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-parts.follows = "flake-parts";
     };
     nvf = {
       url = "github:notashelf/nvf";
       inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-parts.follows = "flake-parts";
     };
     phoenix = {
       url = "github:celenityy/Phoenix";
@@ -33,10 +39,12 @@
     stylix = {
       url = "github:nix-community/stylix";
       inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-parts.follows = "flake-parts";
     };
   };
-  outputs = {
+  outputs = inputs @ {
     agenix,
+    flake-parts,
     home-manager,
     impermanence,
     nixos-mailserver,
@@ -95,10 +103,17 @@
         }
         noshell.nixosModules.default
       ]);
-  in {
-    nixosConfigurations =
-      builtins.mapAttrs
-      (hostname: value: configurationWithHomeManager value)
-      machines;
-  };
+  in
+    flake-parts.lib.mkFlake {inherit inputs;} (top @ {
+      config,
+      withSystem,
+      moduleWithSystem,
+      ...
+    }: {
+      systems = ["x86_64-linux"];
+      flake.nixosConfigurations =
+        builtins.mapAttrs
+        (hostname: value: configurationWithHomeManager value)
+        machines;
+    });
 }