add flake updating timer

modules/timers/default.nix

@@ -3,5 +3,6 @@
     ./wol.nix
     ./backup.nix
     ./rooms.nix
+    ./flakeUpdate.nix
   ];
 }

modules/timers/flakeUpdate.nix

@@ -0,0 +1,39 @@
+{
+  lib,
+  config,
+  ...
+}: let
+  inherit (lib) mkEnableOption mkIf;
+  cfg = config.horseman.timers.flakeUpdate;
+in {
+  options = {
+    horseman.timers.flakeUpdate = {
+      enable = mkEnableOption "Updates flake.nix weekly";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.timers."flake-update" = {
+      wantedBy = ["timers.target"];
+      timerConfig = {
+        OnCalendar = "weekly";
+        Persistent = true;
+      };
+    };
+
+    systemd.services."flake-update" = {
+      script = ''
+        cd /home/horseman/nix-config
+        git pull
+        nix flake update
+        rebuild .#${config.networking.hostName}
+        git commit flake.lock -m "Update flake"
+        git push
+      '';
+      serviceConfig = {
+        Type = "oneshot";
+        User = "root";
+      };
+    };
+  };
+}