@papiris what you are asking for is....kubernetes. offload state to some other machine if possible (db, storage...) and use some dedicated OS like Talos and reduce the amount of maintenance. argo or flux for gitops, for talos talhelper is very nice and declarative.

if you can live with giving up some features, have a look at incus or proxmox. but if you want storage with high availability you are probably going to use ceph and the complexity increases.