youtrack service: restart on failure

nixos/modules/services/web-apps/youtrack.nix

@@ -128,6 +128,7 @@ in
         Type = "simple";
         User = "youtrack";
         Group = "youtrack";
+        Restart = "on-failure";
         ExecStart = ''${cfg.package}/bin/youtrack --J-Xmx${cfg.maxMemory} --J-XX:MaxMetaspaceSize=${cfg.maxMetaspaceSize} ${cfg.jvmOpts} ${cfg.address}:${toString cfg.port}'';
       };
     };