[stable/percona-xtradb-cluster] fix StatefulSet apiVersion for Kubernetes 1.16+ (#22236)

* fix StatefulSet apiVersion for Kubernetes 1.16+

Signed-off-by: Устюжанин Антон Александрович <ustuzhanin@tochka.com>

* fix StatefulSet apiVersion for Kubernetes 1.16+

Signed-off-by: Устюжанин Антон Александрович <ustuzhanin@tochka.com>

Co-authored-by: Устюжанин Антон Александрович <ustuzhanin@tochka.com>

stable/percona-xtradb-cluster/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: percona-xtradb-cluster
-version: 1.0.3
+version: 1.0.4
 appVersion: 5.7.19
 description: free, fully compatible, enhanced, open source drop-in replacement for
   MySQL with Galera Replication (xtradb)

stable/percona-xtradb-cluster/templates/_helpers.tpl

@@ -23,3 +23,11 @@ https://www.percona.com/doc/percona-xtradb-cluster/LATEST/wsrep-system-index.htm
 {{- $name := default "pxc" .Values.nameOverride -}}
 {{- printf "%s-%s" .Release.Name $name | trunc 32 | trimSuffix "-" -}}
 {{- end -}}
+
+{{- define "percona-xtradb-cluster.statefulset.apiVersion" -}}
+{{- if .Capabilities.APIVersions.Has "apps/v1/StatefulSet" -}}
+{{- print "apps/v1" -}}
+{{- else -}}
+{{- print "apps/v1beta2" -}}
+{{- end -}}
+{{- end -}}

stable/percona-xtradb-cluster/templates/statefulset.yaml

@@ -1,4 +1,4 @@
-apiVersion: apps/v1beta2
+apiVersion: {{ template "percona-xtradb-cluster.statefulset.apiVersion" . }}
 kind: StatefulSet
 metadata:
   name: {{ template "percona-xtradb-cluster.fullname" . }}