nixos-config/system/test-timer.nix

{ pkgs, config, lib, ... }: {
  systemd.services."test-and-bump-config" = {
    startAt = "20:30";
    path = [ pkgs.nix pkgs.gnutar pkgs.gzip pkgs.git pkgs.git-crypt ];
    serviceConfig = {
      Type = "oneshot";
      WorkingDirectory = "/var/cache/gc-links";
      ExecStart =
        "${(import ../lib/test.nix).test-config}/bin/test-config bump";
    };
  };
}