Always backup both certs and kubeconfig

There are no reasons not to backup during upgrade

Signed-off-by: Etienne Champetier <e.champetier@ateme.com>

roles/kubernetes/control-plane/tasks/kubeadm-backup.yml

@@ -0,0 +1,28 @@
+---
+- name: Backup old certs and keys
+  copy:
+    src: "{{ kube_cert_dir }}/{{ item }}"
+    dest: "{{ kube_cert_dir }}/{{ item }}.old"
+    mode: preserve
+    remote_src: yes
+  with_items:
+    - apiserver.crt
+    - apiserver.key
+    - apiserver-kubelet-client.crt
+    - apiserver-kubelet-client.key
+    - front-proxy-client.crt
+    - front-proxy-client.key
+  ignore_errors: yes
+
+- name: Backup old confs
+  copy:
+    src: "{{ kube_config_dir }}/{{ item }}"
+    dest: "{{ kube_config_dir }}/{{ item }}.old"
+    mode: preserve
+    remote_src: yes
+  with_items:
+    - admin.conf
+    - controller-manager.conf
+    - kubelet.conf
+    - scheduler.conf
+  ignore_errors: yes