Aiui, modern truenas apps are docker containers under the hood. They are supposed to be “easier” to manage than a vanilla docker container.
This is an opinionated topic. IMO, running apps on TrueNAS is not a good idea considering the number of migrations you would need to perform through the years (judging by the track record). But if you absolutely must, this guide is the way to go.
Again, all that is only my opinion. And mb you shouldn’t even consider this approach if you are not familiar with docker.
Do you plan to make your minio publicly available or what?