nixos/blocky: allow socket db connection (#492411)

        ProtectKernelTunables = true;

        ProtectSystem = "strict";

        Restart = "on-failure";

        RestrictAddressFamilies = [

        RestrictAddressFamilies =

          let

            logType = lib.attrByPath [ "settings" "queryLog" "type" ] "" cfg;

          in

          (lib.optional (lib.elem logType [

            "mysql"

            "postgresql"

            "timescale"

          ]) "AF_UNIX")

          ++ [

            "AF_INET"

            "AF_INET6"

          ];