I’m an Unraid user and I’m a noob at building containers. But I don’t think it’s as easy as a one click solution unless something major changes in the Lemmy code. Right now it’s a 2-3 container solution IIRC - database, Lemmy, and Lemmy-UI (the web frontend).
The ansible install instructions surprised me at how simple they were. Edit a few (2-3) config files and run a script, wait like 30 seconds and your instance is ready.