root_ssh: Support multiple SSH keys for the same user + root_ssh: Add additional SSH key for klausenbusk

Ex: in case the user has multiple smartcards.

group_vars/all/root_access.yml

@@ -22,6 +22,7 @@ root_ssh_keys:
   - key: svenstaro.pub
   - key: anthraxx.pub
   - key: klausenbusk.pub
+    additional_keys: [klausenbusk_2.pub]
 
 # run playbook 'playbooks/tasks/reencrypt-vault-key.yml' when this changes
 # before running it, make sure to gpg --lsign-key all of the below keys