MySmallPhpTools dependency

[ChinaShrimp]

I'm using NC 18.0 and dashboard app (source code, not published in app store). After installing the built dashboard to apps directory, nextcloud starts with complaining logs:

[Tue Jan 21 11:57:10 2020] PHP Fatal error:  Trait 'daita\MySmallPhpTools\Traits\TArrayTools' not found in /Users/lyon/workspace/nextcloud/server/apps/dashboard/lib/Service/WidgetsService.php on line 49
[Tue Jan 21 11:57:10 2020] ::1:56602 [500]: /index.php/apps/files/ - Trait 'daita\MySmallPhpTools\Traits\TArrayTools' not found in /Users/lyon/workspace/nextcloud/server/apps/dashboard/lib/Service/WidgetsService.php on line 49
[Tue Jan 21 11:57:10 2020] Trait 'daita\MySmallPhpTools\Traits\TArrayTools' not found at /Users/lyon/workspace/nextcloud/server/apps/dashboard/lib/Service/WidgetsService.php#49

Reproduce steps:

1. Setup nextcloud 18.0;
2. git clone dashboard app and run 'make all' under dashboard app root directory;
3. copy built artifact dashboard-6.0.0.tar.gz to nextcloud apps directory, untar it and rename the app directory name to dashboard;
4. restart nextcloud;

From my view, this problem is caused by lacking of dependency of 3rd party lib(MySmallPhpTools), and I turned to Makefile:

appstore: composer npm clean
	mkdir -p $(sign_dir)
	rsync -a \
	--exclude=/build \
	--exclude=/docs \
	--exclude=/l10n/templates \
	--exclude=/l10n/.tx \

Before zipping the app, vendor directory is deleted due to clean task in the Makefile.

So I removed 'clean' for appstore task and nextcloud starts successfully without above complaining logs.

I'm not sure whether this modification is right, and need your help. Thanks!