Update cronjob apiversion to batch/v1

The batch/v2alpha1 CronJob type definitions and clients are
deprecated and removed in Kubernetes v1.21

Signed-off-by: Konstantin Misyutin <[email protected]>

Author: ikeeip

README.md

@@ -6,7 +6,7 @@ Deploy Kubernetes in Kubernetes using Helm
 
 ## Requirements
 
-* Kubernetes v1.15+
+* Kubernetes v1.21+
 * Helm v3
 * cert-manager v1.0.0+
 

deploy/helm/kubernetes/templates/etcd-backup-cronjob.yaml

@@ -1,7 +1,7 @@
 {{- if .Values.etcd.backup.enabled }}
 {{- $fullName := include "kubernetes.fullname" . -}}
 ---
-apiVersion: batch/v1beta1
+apiVersion: batch/v1
 kind: CronJob
 metadata:
   name: {{ $fullName }}-etcd-backup

deploy/helm/kubernetes/templates/kubeadm-cronjob.yaml

@@ -1,7 +1,7 @@
 {{- if .Values.admin.job.enabled }}
 {{- $fullName := include "kubernetes.fullname" . -}}
 ---
-apiVersion: batch/v1beta1
+apiVersion: batch/v1
 kind: CronJob
 metadata:
   name: "{{ $fullName }}-kubeadm-tasks"