base/network-{dhcp,static}: re-add hardwareAddress param

base/network-dhcp.nix

@@ -17,6 +17,13 @@ in
 {
   options.network-dhcp = {
     enable = mkEnableOption "Enables DHCP networking on host";
+
+    hardwareAddress = mkOption {
+      type = types.str;
+      default = "";
+      description = "MAC address of primary ethernet interface";
+      example = "11:22:33:44:55:66";
+    };
   };
 
   config = mkIf cfg.enable {

base/network-static.nix

@@ -27,6 +27,13 @@ in
   options.network-static = {
     enable = mkEnableOption "Enables networking config for Hetzner";
 
+    hardwareAddress = mkOption {
+      type = types.str;
+      default = "";
+      description = "MAC address of primary ethernet interface";
+      example = "11:22:33:44:55:66";
+    };
+
     staticAddresses = mkOption {
       type = types.listOf types.str;
       default = [ ];