nixos/agorakit: add phpPackage option and pass it to fpm pool

  user = cfg.user;

  group = cfg.group;

  php = lib.getExe pkgs.php82;

  php = lib.getExe cfg.phpPackage;

  # shell script for local administration

  artisan = pkgs.writeScriptBin "agorakit" ''

  options.services.agorakit = {

    enable = mkEnableOption "agorakit";

    phpPackage = mkPackageOption pkgs "php82" { };

    user = mkOption {

      default = "agorakit";

      description = "User agorakit runs as.";

    services.phpfpm.pools.agorakit = {

      inherit user group;

      phpPackage = cfg.phpPackage;

      phpOptions = ''

        log_errors = on

        post_max_size = ${cfg.maxUploadSize}