Since you run everything in docker, I guess you have experienced the benefits of containerization. So why not leverage that for your host too?

Fedora IoT is a container-based host that runs on your hardware, with a focus on edge device deployment.

fedoraproject.org/iot/ I have it running on two servers as well, and it works great. The only thing I changed is that I layered docker on it instead of using podman, because at the time I had trouble getting my reverse proxy working properly over ipv6