containerd.service requires /etc/sysconfig/containerd to start, but this file
is missing:

Oct 15 17:53:53 excelsior systemd[1]: Failed to start Containerd Standalone OCI
Container Daemon.
Oct 15 17:53:53 excelsior systemd[1]: containerd.service: Failed with result
'start-limit'.
Oct 15 17:54:20 excelsior systemd[1]: containerd.service: Failed to load
environment files: No such file or directory
Oct 15 17:54:20 excelsior systemd[1]: containerd.service: Failed to run 'start'
task: No such file or directory
Oct 15 17:54:20 excelsior systemd[1]: Failed to start Containerd Standalone OCI
Container Daemon.
Oct 15 17:54:20 excelsior systemd[1]: containerd.service: Failed with result
'resources'.

This also affects docker service and makes it unusable.
Workaround: sudo touch /etc/sysconfig/containerd && sudo systemctl restart
containerd.service