IP address and port number are allocated by the cluster: do not
overwrite them during the restore from backup.

Traefik must be restarted to expand restored credentials.

As the pod network namespace is private, we can use a fixed port number
to avoid confusion. The allocated dynamic port number is necessary only
for the public side of the pod.

- Clean up volume before Restic restores it
- Restore the "active from" timestamp
- Restore the "active to" timestamp, by reading it from volume
- Do not restore credentials and tokens: use new ones