add nix flake

flake.lock

@@ -1,5 +1,25 @@
 {
   "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1756770412,
+        "narHash": "sha256-+uWLQZccFHwqpGqr2Yt5VsW/PbeJVTn9Dk6SHWhNRPw=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "4524271976b625a4a605beefd893f270620fd751",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1746904237,
@@ -18,6 +38,7 @@
     },
     "root": {
       "inputs": {
+        "flake-parts": "flake-parts",
         "nixpkgs": "nixpkgs"
       }
     }

flake.nix

@@ -1,24 +1,33 @@
 {
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
   };
 
   outputs =
-    { nixpkgs, ... }:
-    {
-      devShells =
-        let
-          system = "x86_64-linux";
-          pkgs = import nixpkgs { inherit system; };
-        in
-        {
-          ${system}.default = pkgs.mkShellNoCC {
-            packages = with pkgs; [
-              deno
-              pkgs.nil # Nix language server
-              pkgs.nixfmt-rfc-style
-            ];
+    inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake
+      {
+        inherit inputs;
+      }
+      {
+        systems = [
+          "x86_64-linux"
+          "aarch64-linux"
+        ];
+
+        perSystem =
+          { pkgs, ... }:
+          {
+            devShells.default = pkgs.mkShellNoCC {
+              packages = [
+                pkgs.deno
+                pkgs.nil # Nix language server
+                pkgs.nixfmt-rfc-style
+              ];
+            };
           };
-        };
-    };
+      };
 }