[cluster-name]-pebbles ssh alias is broken

if you create a new deployment and use the generated ssh config to ssh into [cluster-name]-pebbles you get an error because the entry is broken somehow.

> Received disconnect from UNKNOWN port 65535:2: Too many authentication failures
> Authentication failed.

Start by reproducing the failure with a new deployment and inspect the generated SSH config entry for [cluster-name]-pebbles. Trace how that alias is produced and compare it with a working SSH entry; done means the generated alias connects without the authentication-failures error.

Written by the indexing model from the issue text.