Added missing config attribute.

modules/hardware/boot.nix

@@ -1,6 +1,7 @@
 { config, ... }:
 
 {
+  config = {
     boot.initrd.systemd.enable = true;
     boot.loader.systemd-boot.enable = true;
     boot.loader.efi.canTouchEfiVariables = true;
@@ -8,4 +9,5 @@
     boot.kernel.sysctl = {
       "vm.overcommit_memory" = 1;
     };
+  };
 }

modules/networking/firewall.nix

@@ -1,6 +1,7 @@
 { config, ... }:
 
 {
+  config = {
     networking.nftables.enable = true;
     networking.firewall = {
       enable = true;
@@ -8,4 +9,5 @@
       allowedTCPPorts = [ 53 80 443 ];
       allowedUDPPorts = [ 53 443 ];
     };
+  };
 }

modules/networking/networking.nix

@@ -37,6 +37,7 @@ in
     };
   };
 
+  config = {
     networking.hostName = "numbus-server";
     networking.networkmanager.enable = false;
 
@@ -55,4 +56,5 @@ in
       address = "${cfg.routerIpAddress}";
       interface = "br0";
     };
+  };
 }