nixos/wakapi: harden systemd service (#389534)

        Group = config.users.users.wakapi.group;

        DynamicUser = true;

        PrivateTmp = true;

        PrivateUsers = true;

        PrivateDevices = true;

        ProtectHome = true;

        ProtectHostname = true;

        ProtectClock = true;

        ProtectKernelLogs = true;

        ProtectKernelModules = true;

        ProtectKernelTunables = true;

        ProtectControlGroups = true;

        NoNewPrivileges = true;

        ProtectProc = "invisible";

        ProtectSystem = "strict";

        ProtectSystem = "full";

        RestrictAddressFamilies = [

          "AF_INET"

          "AF_INET6"

          "AF_UNIX"

        ];

        CapabilityBoundingSet = "CAP_NET_BIND_SERVICE";

        RestrictNamespaces = true;

        RestrictRealtime = true;

        RestrictSUIDSGID = true;