nixos/gerrit: Apply initial hardening using the systemd unit (#347661)

        StandardOutput = "journal";

        StateDirectory = "gerrit";

        WorkingDirectory = "%S/gerrit";

        AmbientCapabilities = "";

        CapabilityBoundingSet = "";

        LockPersonality = true;

        NoNewPrivileges = true;

        PrivateDevices = true;

        PrivateTmp = true;

        ProtectClock = true;

        ProtectControlGroups = true;

        ProtectHome = true;

        ProtectHostname = true;

        ProtectKernelLogs = true;

        ProtectKernelModules = true;

        ProtectKernelTunables = true;

        ProtectProc = "noaccess";

        ProtectSystem = "full";

        RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" ];

        RestrictNamespaces = true;

        RestrictRealtime = true;

        RestrictSUIDSGID = true;

        SystemCallArchitectures = "native";

        UMask = 027;

      };

    };

  };