I think it was literally called "config". I will check my setup and provide the mount points I used here later today, if you back these up, it should work. Put some disposable data on it once you finished setup and then upgrade to a newer version to see if everything works. You can specify the image tag to use manually (or you install an older chart version).
I also pinned the postgres version to 14, not sure if I can recommend that but I had issues with DB upgrades in a docker installation, so I tend to be careful there.