r/base: Set SSH authorized keys for root

To ensure all machines have the same keys to allow root to log in via
SSH (in case Active Directory is unavailable or something).

roles/base/tasks/main.yml

@@ -21,3 +21,12 @@
   tags:
   - root-user
   - user
+- name: ensure ssh keys are authorized for root login
+  ansible.posix.authorized_key:
+    user: root
+    exclusive: true
+    key: '{{ root_authorized_keys }}'
+  when: root_authorized_keys is defined
+  tags:
+  - root-user
+  - ssh-key