TrueNAS Scale’s Docker implementation is currently really mediocre - it’s implemented as an app store style experience - and deploying/managing containers via the CLI isn’t officially supported although it works fine. They do have a more generic container management implementation in beta at the moment.

If it is a Clariion (looks like it, but kinda blurry) it’s likely a CX4. Those aren’t CX3 bezels on the controllers.

Started messing around with docker containers on a small Synology box a few years ago, dumped Synology with a quickness in favor of just building an Ubuntu-based NAS. I’m running TrueNAS Scale bare metal now and getting ready to dump it to go back to another roll-my-own Linux + ZFS setup, possibly using Cockpit and the ZFS extensions from 45 drives.