The suggested install-config.yaml structure has an error in the part for sshkey.

the suggested structure does not work:

sshKey: |
  '<ssh_pub_key>'

what does work is:

sshKey: |
  <ssh_pub_key>

or

sshKey: '<ssh_pub_key>'

create a install-config with suggested sshkey value, create image, attach it to the VM and start the vm. If you try to ssh to the running node you will get a permission denied message:

core@192.168.11.10: Permission denied (publickey,gssapi-keyex,gssapi-with-mic). 

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Permission denied message

successfull login with core user and provided sshkey