It is a huge turn off for me when knowing that with the recent release of SE does not support mariadb. My server is currently running mariadb and to transition to mysql might be a huge hassle. I would hope that SE would be compatible with both mysql and mariadb
I tried to upgrade from se 4.10.4 to the latest and was interrupted by mysql 5.7 requirement therefore couldn't complete the upgrade. But I have mariadb 5.5 I wonder if it has anything to do with it as I can see you have mariadb 10.3
I was able to upgrade sussessfully to SE 4.10.5 with a little tweak for mariadb server. This however, will not work in the long run as mariadb and mysql might have two separate routes