Hello
We have decided to upgrade in 1.8.11 without docker for the moment (cause this server host other apache/php/mysql site and we want only one way to manage/upgrade the site)
in a few weeks, we will create another VM didecated to xibo or dedicated to multi docker install
upgrade to 1.8.11 without docker is easy, only a small error cause of mcrypt (cause we use PHP 7.3, there is a way to ignore this error editing the file /lib/helper/environnment.php
(Can find mcrypt in PHP 7)
the CMS works perfectly, on my way to upgrade windows xibo-client 
thx