updated flake.lock and added beszel agent environment

hosts/pxe-boot/host.nix

@@ -11,7 +11,9 @@
     defaultGateway = { address = vars.lanGateway; interface = vars.lxcLanInterface; };
     nameservers = [ vars.domainControllerIp ];
   };
-
+services.beszel.agent.environment = {
+#    KEY = "";
+  };
   # Preserved from the pre-refactor `pxe-boot` target — stateVersion must
   # never be bumped on an already-installed machine.
   system.stateVersion = "25.05";