freun.dev: setup transport layout offloads for tailscale

hosts/freun.dev/configuration.nix

@@ -71,6 +71,17 @@
     };
   };
 
+  services.networkd-dispatcher = {
+    enable = true;
+    rules."50-tailscale" = {
+      onState = [ "routable" ];
+      script = ''
+        #!${pkgs.runtimeShell}
+        ${pkgs.ethtool}/bin/ethtool -K ${config.systemd.network.networks.static.name} rx-udp-gro-forwarding on rx-gro-list off
+      '';
+    };
+  };
+
   # Set your time zone.
   time.timeZone = "Europe/Helsinki";