nixos/systemd/nixos-pull.nix

{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";
    };
  };
}