Flakeify NixOS configuration

configuration.nix

@@ -15,6 +15,7 @@
       ./modules/x.nix
     ];
 
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
 
   programs.git.enable = true;
   programs.firefox.enable = true;

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1748437600,
+        "narHash": "sha256-hYKMs3ilp09anGO7xzfGs3JqEgUqFMnZ8GMAqI6/k04=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "7282cb574e0607e65224d33be8241eae7cfe0979",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,12 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-25.05";
+  };
+
+  outputs = { self, nixpkgs }: {
+    nixosConfigurations.nixos = nixpkgs.lib.nixosSystem {
+      system = "x86_64-linux";
+      modules = [ ./configuration.nix ];
+    };
+  };
+}