feat: update allowed TCP port in sgx network configuration

This commit updates the allowed TCP port for networking in the SGX configuration file. Instead of hardcoding the port number, it now uses the port specified in the netatalk configuration. This change enables more flexibility in port assignment and reduces potential conflicts.

systems/x86_64-linux/sgx/network.nix

@@ -37,6 +37,6 @@
     };
   };
 
-  networking.firewall.allowedTCPPorts = [ 548 ];
+  networking.firewall.allowedTCPPorts = [ config.services.netatalk.port ];
   networking.firewall.allowPing = true;
 }

systems/x86_64-linux/t15/hardware-configuration.nix

@@ -94,7 +94,7 @@
 
   console.keyMap = "de-latin1-nodeadkeys";
   services.xserver.xkb = {
-    layout = "de";
+    layout = "de,de+us";
     variant = "nodeadkeys";
   };