Non-Ubuntu Support?

I thought I remembered that when sudobox was created that the ideas was that if you can run docker you would not be pigeonholed to a specific distro. Is there functionality that would run on a full-featured x86 based NAS with a docker CLI?

I was a heavy user of PG until the obvious and in the interim I drastically simplified my home setup by buying a big NAS that dropping gsuite and hetzner has paid off. But I definitely miss the full feature management that PG supplied.

The overall goal is to support as many operating systems as possible