Currently, I'm running Unraid and have Gitlab running as their "omnibus" single container. I've been thinking of switching to Truenas due to various issues with Unraid stability, but as you can imagine that would be a huge pain.
I've also been wanting to set up Immich, but it requires being run as a bunch of individual containers and I don't want to have to spend an entire weekend debugging that, so the one click install of it that HexOS offers is really compelling!
If I were to switch, I could just drop down to Truenas and run Gitlab as a container again, but it seems like it'd also be relatively easy to add it as an app if everything is already in place to run something with a more complicated setup like Immich.
Bonus points for Forgejo. Gitlab can be a bit slow and has tons of features that just distract from the few that I actually use, so if Forgejo was a 1-click install option, I might just migrate everything.