docker: use serviceConfig.ExecStart instead of script

# Systemd services for docker.

{ config, lib, pkgs, ... }:

{ config, lib, utils, pkgs, ... }:

with lib;

        restartIfChanged = false;

        unitConfig.X-StopOnRemoval = false;

        serviceConfig.Type = "oneshot";

        script = ''

          ${cfg.package}/bin/docker system prune -f ${toString cfg.autoPrune.flags}

        '';

        serviceConfig = {

          Type = "oneshot";

          ExecStart = utils.escapeSystemdExecArgs ([

            (lib.getExe cfg.package)

            "system"

            "prune"

            "-f"

          ] ++ cfg.autoPrune.flags);

        };

        startAt = optional cfg.autoPrune.enable cfg.autoPrune.dates;

        after = [ "docker.service" ];