controller ssh key, lookup first found

Assisted-By: Claude (claude-4.5-sonnet)
Signed-off-by: Harald Jensås <hjensas@redhat.com>

Author: hjensas

inventory.yml

@@ -4,4 +4,9 @@ all:
     localhost:
       ansible_connection: local
   vars:
-    controller_ssh_pub_key: "{{ lookup('ansible.builtin.file', '~/.ssh/id_rsa.pub') }}"
+    controller_ssh_pub_key: >-
+      {{ lookup('ansible.builtin.file',
+         lookup('ansible.builtin.first_found',
+                ['~/.ssh/id_rsa.pub',
+                 '~/.ssh/id_ed25519.pub']))
+      }}