[run-vm] add testHost option to module to allow local testing again

machines/modules/malobeo/microvm_host.nix

@@ -14,6 +14,12 @@ in
         description = lib.mdDoc "Setup bridge device for microvms.";
       };
 
+      testHost = mkOption {
+        default = false;
+        type = types.bool;
+        description = lib.mdDoc "Enable when the host is used for development and testing using run-vm";
+      };
+
       interface = mkOption {
         default = "eno1";
         type = types.str;
@@ -68,7 +74,7 @@ in
     systemd.network = mkIf (cfg.enableHostBridge || cfg.enableHostBridgeUnstable) {
       enable = true;
       networks."10-lan" = {
-        matchConfig.Name = [ "${cfg.interface}" "vm-*"];
+        matchConfig.Name = ["vm-*"] ++ (if !cfg.testHost then [ "${cfg.interface}" ] else [ ]);
         networkConfig = {
           Bridge = "malobeo0";
         };
@@ -81,7 +87,7 @@ in
         };
       };
       
-      networks."10-lan-bridge" = {
+      networks."10-lan-bridge" = if !cfg.testHost then {
         matchConfig.Name = "malobeo0";
         networkConfig = {
           Address = [ "${cfg.address}" ];
@@ -90,6 +96,17 @@ in
           IPv6AcceptRA = true;
         };
         linkConfig.RequiredForOnline = "routable";
+      } else {
+        matchConfig.Name = "malobeo0";
+        networkConfig = {
+          DHCPServer = true;
+          IPv6SendRA = true;
+        };
+        addresses = if cfg.enableHostBridgeUnstable then [
+          { Address = "10.0.0.1/24"; }
+        ] else [
+          { Address = "10.0.0.1/24"; }
+        ];
       };
     };