Fixes compatibility with 1.16 (#17535)

Signed-off-by: Xiang Dai <764524258@qq.com>

stable/rocketchat/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: rocketchat
-version: 1.1.12
+version: 1.1.13
 appVersion: 1.3.1
 description: Prepare to take off with the ultimate chat platform, experience the next level of team communications
 keywords:

stable/rocketchat/templates/_helpers.tpl

@@ -40,3 +40,14 @@ Create the name of the service account to use
     {{ default "default" .Values.serviceAccount.name }}
 {{- end -}}
 {{- end -}}
+
+{{/*
+Return the apiVerion of deployment.
+*/}}
+{{- define "deployment.apiVersion" -}}
+{{- if semverCompare "<1.14-0" .Capabilities.KubeVersion.GitVersion -}}
+{{- print "extensions/v1beta1" -}}
+{{- else if semverCompare ">=1.14-0" .Capabilities.KubeVersion.GitVersion -}}
+{{- print "apps/v1" -}}
+{{- end -}}
+{{- end -}}

stable/rocketchat/templates/deployment.yaml

@@ -1,4 +1,4 @@
-apiVersion: extensions/v1beta1
+apiVersion: {{ template "deployment.apiVersion" . }}
 kind: Deployment
 metadata:
   name: {{ template "rocketchat.fullname" . }}