Bugfix/11936 - backup: "{{ leave_etc_backup_files }}" (#11937)

* Adding the var: leave_etc_backup_files

* Fix for #11936 - backup: "{{ leave_etc_backup_files }}"

roles/kubernetes/preinstall/tasks/0063-networkmanager-dns.yml

@@ -6,7 +6,7 @@
     option: servers
     value: "{{ nameserverentries | join(',') }}"
     mode: '0600'
-    backup: true
+    backup: "{{ leave_etc_backup_files }}"
   when:
     - ('127.0.0.53' not in nameserverentries
        or systemd_resolved_enabled.rc != 0)
@@ -24,7 +24,7 @@
     option: searches
     value: "{{ (default_searchdomains | default([]) + searchdomains) | join(',') }}"
     mode: '0600'
-    backup: true
+    backup: "{{ leave_etc_backup_files }}"
   notify: Preinstall | update resolvconf for networkmanager
 
 - name: NetworkManager | Add DNS options to NM configuration
@@ -34,5 +34,5 @@
     option: options
     value: "ndots:{{ ndots }},timeout:{{ dns_timeout | default('2') }},attempts:{{ dns_attempts | default('2') }}"
     mode: '0600'
-    backup: true
+    backup: "{{ leave_etc_backup_files }}"
   notify: Preinstall | update resolvconf for networkmanager