qa/suites/crimson-rados/perf: add ssh keys

cbt use ssh connection by defualt, without ssh_keys the task
won't generate public key and the cbt task will fail

Fixes: https://tracker.ceph.com/issues/68421
Signed-off-by: Nitzan Mordechai <[email protected]>

Author: NitzanMordhai

qa/suites/crimson-rados/perf/deploy/ceph.yaml

@@ -10,3 +10,4 @@ tasks:
       osd:
         debug monc: 20
     flavor: crimson
+- ssh_keys: