We do have a cockpit-podman plugin and have added recently some features to simplify management of podman quadlets. (podman quadlets is like a systemd-friendly version of docker compose, which is a good fit for a single server use case)

So if you get onboard with podman, you may get some benefits from the Cockpit UI for it.

But you are right, there are many different container technologies and we haven't catched up with all of them.

I recently moved from a docker-compose setup with portainer as a manager to podman+quadlets+cockpit . After the initial pain of migration i'm really happy! I can also manage VMs, volumes, and check systemd logs so it's a good all-in-one solution for managing standalone servers. Also i think it uses systemd activation so it's really light on resources. For someone who dislikes the proxmox approach of custom kernel/os this is a good alternative.