This is already listed in the main NextCloud topic : [Nextcloud] A cloud for personal or group use - #627 by roiburgonde
And it seems that it is written in the configuration : nextcloud_ynh/conf/config.json at master 路 YunoHost-Apps/nextcloud_ynh 路 GitHub
(I have no idea why, but with this, everybody have this information)
This setting was defined 7 years ago, and there is a message about it only in last NextCloud鈥檚 version 
edit : the commit with this change : [enh] Disable code source integrity checking (bugfix #408) 路 YunoHost-Apps/nextcloud_ynh@85dff2b 路 GitHub