split nix and system; fix remote building; reboot after upgrade

Flake lock file updates:

• Updated input 'my-nixpkgs':
    'github:qaristote/my-nixpkgs/65eb03f15116223871d06254dc453abc79bcffaa' (2025-03-18)
  → 'github:qaristote/my-nixpkgs/f2e0f4c86f3318cc6df018b1948dd5bade77f082' (2025-03-22)
• Updated input 'nixos-hardware':
    'github:NixOS/nixos-hardware/4f4d97d7b7be387286cc9c988760a7ebaa5be1f1' (2025-03-17)
  → 'github:NixOS/nixos-hardware/380ed15bcd6440606c6856db44a99140d422b46f' (2025-03-22)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/a1185f4064c18a5db37c5c84e5638c78b46e3341' (2025-03-16)
  → 'github:NixOS/nixpkgs/7105ae3957700a9646cc4b766f5815b23ed0c682' (2025-03-20)

1 files changed, 17 insertions, 0 deletions

diff --git a/config/system.nix b/config/system.nix
new file mode 100644
index 0000000..5b6ba5f
--- /dev/null
+++ b/config/system.nix
@@ -0,0 +1,17 @@
+{...}: {
+  personal.system = {
+    flake = "git+file:///etc/nixos/";
+    autoUpgrade = {
+      enable = true;
+      remoteBuilding = {
+        enable = true;
+        builder.domain = "local";
+      };
+    };
+  };
+
+  system.autoUpgrade = {
+    allowReboot = true;
+    dates = "02:00";
+  };
+}