run the power saving script automatically

configuration.nix

@@ -45,6 +45,20 @@
     wget
   ];
 
+  virtualisation.virtualbox.host.enable = true;
+
+  systemd.services.powerswitch = {
+    enable = true;
+    wantedBy = [ "multi-user.target" "suspend.target" ];
+    after = [ "suspend.target" "display-manager.service" ];
+    description = "Run powerswitch sometimes";
+    path = [ pkgs.hdparm pkgs.iw pkgs.gawk pkgs.kmod config.system.sbin.modprobe ];
+    preStart = "sleep 2s";
+    serviceConfig = {
+      Type = "oneshot";
+      ExecStart = ''/etc/powerdown/powerswitch'';
+    };
+  };
 
   # TODO: cups.