This example shows how to use the ssh_public_keys to add ssh keys for a user during an automated install session. Each key will be added to the $HOME/.ssh/authorized_keys for the named user.
<property_group type="application" name="user_account">
<...>
<property type="astring" name="ssh_public_keys">
<astring_list>
<value_node value='[<options>] <key-type>
<base64-encoding-key> [<comment>]' />
<value_node value='[<options>] <key-type>
<base64-encoding-key> [<comment>]' />
</astring_list>
</property>
</property_group>