move wol out of base

modules/system/misc/wol.nix

@@ -0,0 +1,23 @@
+{ pkgs, wol, ... }: {
+  systemd.services."wol" = {
+    enable = wol != "";
+    description = "Wake-on-LAN for ${wol}";
+    requires = [ "network.target" ];
+    after = [ "network.target" ];
+    serviceConfig = {
+      ExecStart = "${pkgs.ethtool}/bin/ethtool -s ${wol} wol g";
+      Type = "oneshot";
+    };
+    wantedBy = [
+      # just in case
+      "multi-user.target"
+      "sleep.target"
+      "suspend.target"
+      "hibernate.target"
+      "hybrid-sleep.target"
+      "shutdown.target"
+      "reboot.target"
+      "halt.target"
+    ];
+  };
+}