fix(nixos): decouple game startup from guest readiness

configs/nixos/modules/services/steamcmd.nix

@@ -142,24 +142,33 @@
             };
           };
 
+          "${service.serviceName}-autostart" = {
+            description = "Queue ${service.serviceName} game server startup";
+            after = [ "network-online.target" ];
+            wants = [ "network-online.target" ];
+            wantedBy = [ "multi-user.target" ];
+            serviceConfig = {
+              Type = "oneshot";
+              ExecStart = "${pkgs.systemd}/bin/systemctl --no-block start ${service.serviceName}.service";
+            };
+          };
+
           ${service.serviceName} = {
             description = "${service.serviceName} game server";
             after = [
-              "multi-user.target"
               "network-online.target"
               "steamcmd-${service.serviceName}-update.service"
             ];
-            wants = [ "network-online.target" ];
-            wantedBy = [ "multi-user.target" ];
+            wants = [
+              "network-online.target"
+              "steamcmd-${service.serviceName}-update.service"
+            ];
             serviceConfig = {
               Type = "simple";
               User = user;
               Group = group;
               WorkingDirectory = "-${service.installDir}";
-              ExecStartPre = [
-                "+${prepareScript}"
-                updateScript
-              ];
+              ExecStartPre = "+${prepareScript}";
               ExecStart = startScript;
               Restart = "on-failure";
               TimeoutStartSec = "15min";