[run-vm] optional forward ports

currently only allows forwarding to port 80, i was to lazy to handle two
arguments in bash

machines/modules/host_builder.nix

@@ -135,8 +135,8 @@ rec {
         }]);
 
         #if networking is disabled forward port 80 to still have access to webservices
-        forwardPorts = pkgs.lib.mkIf (!options.withNetworking) (pkgs.lib.mkForce [
-          { from = "host"; host.port = 8080; guest.port = 80; }
+        forwardPorts = pkgs.lib.mkIf (!options.withNetworking && options.fwdPort != 0) (pkgs.lib.mkForce [
+          { from = "host"; host.port = options.fwdPort; guest.port = 80; }
         ]);
 
       };
@@ -212,12 +212,13 @@ rec {
       builtins.listToAttrs (map mapperFunc self.nixosConfigurations.${host}.config.services.malobeo.microvm.deployHosts);
     };
 
-    buildVM = host: networking: sopsDummy: disableDisko: varPath: writableStore: (self.nixosConfigurations.${host}.extendModules {
+    buildVM = host: networking: sopsDummy: disableDisko: varPath: writableStore: fwdPort: (self.nixosConfigurations.${host}.extendModules {
         modules = [
             (vmMicroVMOverwrites host { 
               withNetworking = networking; 
               varPath = "${varPath}"; 
-              writableStore = writableStore; })
+              writableStore = writableStore;
+              fwdPort = fwdPort; })
             (if sopsDummy then (vmSopsOverwrites host) else {})
             (if disableDisko then vmDiskoOverwrites else {})
           ] ++ pkgs.lib.optionals (hosts.malobeo.hosts.${host}.type != "microvm") [