tap-up: execute after network.target

required bridge devices may not exists until `network.target` is reached

Author: MarcelCoding

nixos-modules/host/default.nix

@@ -132,6 +132,7 @@ in
         description = "Setup MicroVM '%i' TAP interfaces";
         before = [ "microvm@%i.service" ];
         partOf = [ "microvm@%i.service" ];
+        after = [ "network.target" ];
         unitConfig.ConditionPathExists = "${stateDir}/%i/current/bin/tap-up";
         restartIfChanged = false;
         serviceConfig = {