Clarification on latest MariaDB images

We are looking for some clarification regarding the MariaDB container images in Registry1. It appears Iron Bank is pointing at the specific image tags, as opposed to pointing at the mariadb10x repository and using the latest tag. Also, the “mariadb” repo has 10.2.39 marked as latest, although 10.6.0 is in the same repo. In addition, 10.5.10 is in “mariadb” as well with a push date of June 3rd 2020, but in the “mariadb105” repo the version marked as latest is 10.5.8 and has a push date of Dec 2020. The "mariadb" repo seems to have a plethora of versions, ranging from 10.2.x all the way to 10.6.x. Is 10.6.0 still in development? Which version of 10.5.x is latest? We also noticed that the container images were not being rebuilt every 12 hours. Any insight you could provide would be much appreciated.