I googled it. Looks pretty cool, I could definitely see it filling a niche: container-driven home services for less technical people. Good idea!
I think the only other thing I've seen really like it is that diet pi thing: https://dietpi.com/
I've been bumping into this same issue, it looks like the Trilium container isn't saving anything into it's trilium-data/ volume. The docker-compose.yml for HomeLabOS omits setting the TRILIUM_DATA_DIR environment variable to the data volume as in Trilium's docker-compose.yml.
I'll keep poking around a bit but I'm no docker expert and I can't seem to 'docker attach' to the Trilium container to really have a look at where the data goes.
Check out LGSM_
There's a multitude of different game servers you may consider hosting. Even if you don't actually use LGSM, it'll still give you ideas.