improvements with lbu handling

deploy.yml

@@ -4,3 +4,7 @@
   become_method: doas
   roles:
     - basic
+  post_tasks:
+    - name: lbu commit
+      lbu:
+        commit: true

roles/basic/tasks/main.yml

@@ -24,12 +24,10 @@
     path: /home/rilla/.ssh/authorized_keys
   with_file:
     - public_keys/yubikey
+  register: ssh_keys
 
 - name: commit ssh public keys with lbu
   lbu:
     include:
       - /home/rilla/.ssh/authorized_keys
-
-- name: lbu commit
-  lbu:
-    commit: true
+  when: ansible_distribution == "Alpine" and ssh_keys.changed