append fixes

tasks/users.yml

@@ -2,7 +2,7 @@
 - name: Adjust root password
   user:
     name: root
-    password: "{{ root_user_cred }}"
+    password: "{{ root_user_cred | string | password_hash('sha512') }}"
 
 - name: list active users
   shell: grep -v "nologin" /etc/passwd | cut -f 1 -d ":"