always restart foundry

nixos/boxes/vpsfree1/foundryvtt.nix

@@ -37,6 +37,7 @@
             mkdir -p /var/lib/foundryvtt
             ${pkgs.nodejs-18_x}/bin/node ${foundryvtt}/resources/app/main.js --dataPath=/var/lib/foundryvtt
           '';
+          serviceConfig.Restart = "always";
         };
       };