At least Fedora and RHEL 9 set RSAMinSize=2048, so when trying to use
failsafe, we get 'Bad server host key: Invalid key length'
To workaround the issue, we can use: ssh -o RSAMinSize=1024 ...
Generating 2048 bits RSA is extremely slow, so add ed25519.
We keep RSA 1024 to be as compatible as possible.
Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>
(cherry picked from commit 6ac61dead99ff6b9df00c29b7a858772449718b2)
ee910d1e67