nixos/docker: add auto prune randomizedDelaySec and persistent options (#301547)

          which the prune will occur.

        '';

      };

      randomizedDelaySec = mkOption {

        default = "0";

        type = types.singleLineStr;

        example = "45min";

        description = ''

          Add a randomized delay before each auto prune.

          The delay will be chosen between zero and this value.

          This value must be a time span in the format specified by

          {manpage}`systemd.time(7)`

        '';

      };

      persistent = mkOption {

        default = true;

        type = types.bool;

        example = false;

        description = ''

          Takes a boolean argument. If true, the time when the service

          unit was last triggered is stored on disk. When the timer is

          activated, the service unit is triggered immediately if it

          would have been triggered at least once during the time when

          the timer was inactive. Such triggering is nonetheless

          subject to the delay imposed by RandomizedDelaySec=. This is

          useful to catch up on missed runs of the service when the

          system was powered down.

        '';

      };

    };

    package = mkPackageOption pkgs "docker" { };

        requires = [ "docker.service" ];

      };

      systemd.timers.docker-prune = mkIf cfg.autoPrune.enable {

        timerConfig = {

          RandomizedDelaySec = cfg.autoPrune.randomizedDelaySec;

          Persistent = cfg.autoPrune.persistent;

        };

      };

      assertions = [

        { assertion = cfg.enableNvidia && pkgs.stdenv.hostPlatform.isx86_64 -> config.hardware.graphics.enable32Bit or false;

          message = "Option enableNvidia on x86_64 requires 32-bit support libraries";