nixos/meilisearch: harden (#427768)

        WorkingDirectory = "%S/meilisearch";

        RuntimeDirectory = "meilisearch";

        RuntimeDirectoryMode = "0700";

        ProtectSystem = "strict";

        ProtectHome = true;

        ProtectClock = true;

        ProtectHostname = true;

        ProtectKernelLogs = true;

        ProtectKernelModules = true;

        ProtectKernelTunables = true;

        ProtectControlGroups = true;

        PrivateTmp = true;

        PrivateMounts = true;

        PrivateUsers = true;

        PrivateDevices = true;

        RestrictRealtime = true;

        RestrictNamespaces = true;

        RestrictSUIDSGID = true;

        LockPersonality = true;

        MemoryDenyWriteExecute = true;

        ProcSubset = "pid";

        ProtectProc = "invisible";

        NoNewPrivileges = true;

        # Meilisearch does not support listening on AF_UNIX sockets,

        # so we currently restrict it to only AF_INET and AF_INET6.

        RestrictAddressFamilies = [

          "AF_INET"

          "AF_INET6"

        ];

        CapabilityBoundingSet = "";

        SystemCallArchitectures = "native";

        SystemCallFilter = [

          "@system-service"

          "~@privileged @resources"

        ];

        UMask = "0077";

      };

    };

  };