Initial add systemd timer to keep config repo up to date

systemd/nixos-pull.nix

@@ -0,0 +1,21 @@
+{ pkgs, ... }:
+{
+  systemd.timers."nixos-pull-config" = {
+    wantedBy = [ "timers.target" ];
+    description = "Timer to update /etc/nixos/config/ repository";
+    timerConfig = {
+      OnBootSec = "5m";
+      OnUnitActiveSec = "5m";
+      Unit = "hello-world.service";
+    };
+  };
+  systemd.services."nixos-pull-config" = {
+    script = ''
+      ${pkgs.git}/bin/git pull -C /etc/nixos/config/ --ff-only --no-edit
+    '';
+    serviceConfig = {
+      Type = "oneshot";
+      User = "root";
+    };
+  };
+}