e0650218a6
When Talos `controlplane` node is waiting for a bootstrap, `etcd` contents can be recovered from a snapshot created with `talosctl etcd snapshot` on a healthy cluster. Bootstrap process goes same way as before, but the etcd data directory is recovered from the snapshot. This flow enables disaster recovery for the control plane: given that periodic backups are available, destroy control plane nodes, re-create them with the same config, and bootstrap one node with the saved snapshot to recover etcd state at the time of the snapshot. Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>