nixos/monica: add phpPackage option and pass it to phpfpm pool

  user = cfg.user;

  group = cfg.group;

  php = lib.getExe pkgs.php83;

  php = lib.getExe cfg.phpPackage;

  # shell script for local administration

  artisan = pkgs.writeScriptBin "monica" ''

  options.services.monica = {

    enable = mkEnableOption "monica";

    phpPackage = mkPackageOption pkgs "php83" { };

    user = mkOption {

      default = "monica";

      description = "User monica runs as.";

    services.phpfpm.pools.monica = {

      inherit user group;

      phpPackage = cfg.phpPackage;

      phpOptions = ''

        log_errors = on

        post_max_size = ${cfg.maxUploadSize}