crmsh has issue with the default ed25519 ssh key

[liangxin1300]

When the init node already generated ssh key(default kind is ed25519), join node will failed:

INFO: Configuring SSH passwordless with root@alp-1
DEBUG: su_subprocess_run: ['/bin/sh', '-c', "ssh-copy-id -i ~/.ssh/id_rsa.pub 'root@alp-1' &> /dev/null"], {}
ERROR: cluster.join: Failed to login to root@alp-1. Please check the credentials.
Traceback (most recent call last):
  File "/usr/lib/python3.11/site-packages/crmsh/ui_context.py", line 93, in run
    rv = self.execute_command() is not False
         ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/crmsh/ui_context.py", line 276, in execute_command
    rv = self.command_info.function(*arglist)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/crmsh/ui_cluster.py", line 520, in do_join
    bootstrap.bootstrap_join(join_context)
  File "/usr/lib/python3.11/site-packages/crmsh/bootstrap.py", line 2314, in bootstrap_join
    join_ssh(cluster_node, remote_user)
  File "/usr/lib/python3.11/site-packages/crmsh/bootstrap.py", line 1602, in join_ssh
    return join_ssh_impl(local_user, seed_host, seed_user, keys)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/crmsh/bootstrap.py", line 1624, in join_ssh_impl
    raise ValueError(msg)
ValueError: Failed to login to root@alp-1. Please check the credentials.

It seems we have lots of places hard-coded as id_rsa.pub

[liangxin1300]

Above comment seems can't reproduce now

But there does exist another issue: When the init node and join node are already setup passwordless with the ed25519 key, then after bootstrap init/join process, there is still a key pair generated on the init node