Hey, OP here again.

Here’s what I ended up with:

• upgrading my TrueNAS CORE to TrueNAS SCALE - it was really easy, just upload a 1.3GB upload file through the web UI. CORE’s apps/plugins are based on BSD jails, where SCALE apps are based on Kubernetes/Docker, so I can any arbitrary Docker container from Dockerhub as I please, rather than being limited to BSD jails

• migrating all the VMs/LXCs to matching TrueNAS SCALE Applications. So e.g. my hand-made Navidrome LXC was migrated to the TrueNAS SCALE Application. Sometimes there was no equivalent TrueNAS app for what I was using - e.g. Forgejo, so I just ran an arbitrary container from dockerhub.

• decomissioning the Proxmox mini-pc (Lenovo M920q). I’ll sell it later or maybe turn it into a pfSense router.

I installed a custom TrueNAS app repository called Truecharts. It has some apps that the default repo doesn’t have, and it also has a nice integration with Ingress (Traefik), which allows you to easily create a reverse proxy using just the GUI.

I’m still yet to figure out how to set up Let’s Encrypt for the services I made available to the Internet. I can no longer do things the Linux way, i must do it the Kubernetes way, so I’m kind of limited. Looks like HTTP01 challenges don’t work yet and I’ll have to use DNS01.