feat: add flakes to nix iso

.gitignore

@@ -0,0 +1 @@
+/result

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1764517877,
+        "narHash": "sha256-pp3uT4hHijIC8JUK5MEqeAWmParJrgBVzHLNfJDZxg4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2d293cbfa5a793b4c50d17c05ef9e385b90edf6c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -19,6 +19,11 @@
 
                 networking.networkmanager.enable = true;
 
+                nix.settings.experimental-features = [
+                  "nix-command"
+                  "flakes"
+                ];
+
                 environment.systemPackages = with pkgs; [
                   neovim
                   git