[stable/external-dns] Update psp apiVersion to 'policy/v1beta1' - Mandatory for K8s 1.16 (#17288)

* [stable/external-dns] Update psp apiVersion to 'policy/v1beta1' - Mandatory for K8s 1.16

Signed-off-by: juan131 <juan@bitnami.com>

* Update prerequisites

Signed-off-by: juan131 <juan@bitnami.com>

* Add a macro to decide the ApiVersion to use for PSP based on K8s API

Signed-off-by: juan131 <juan@bitnami.com>

* Fix chart version

Signed-off-by: juan131 <juan@bitnami.com>

stable/external-dns/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: external-dns
-version: 2.6.3
+version: 2.6.4
 appVersion: 0.5.17
 description: ExternalDNS is a Kubernetes addon that configures public DNS servers with information about exposed Kubernetes services to make them discoverable.
 keywords:

stable/external-dns/templates/_helpers.tpl

@@ -206,6 +206,17 @@ external-dns: infoblox.wapiPassword
 {{- end -}}
 {{- end -}}
 
+{{/*
+Return the appropriate apiVersion for PodSecurityPolicy.
+*/}}
+{{- define "podSecurityPolicy.apiVersion" -}}
+{{- if semverCompare ">=1.14-0" .Capabilities.KubeVersion.GitVersion -}}
+{{- print "policy/v1beta1" -}}
+{{- else -}}
+{{- print "extensions/v1beta1" -}}
+{{- end -}}
+{{- end -}}
+
 {{/*
 Validate values of External DNS:
 - must provide the PowerDNS API URL when provider is "pdns"

stable/external-dns/templates/psp.yaml

@@ -1,5 +1,5 @@
 {{- if .Values.rbac.pspEnabled }}
-apiVersion: extensions/v1beta1
+apiVersion: {{ template "podSecurityPolicy.apiVersion" . }}
 kind: PodSecurityPolicy
 metadata:
   name: {{ template "external-dns.fullname" . }}