feat(prometheus-couchdb-exporter): add configurable apiVersion (#384)

Signed-off-by: Gabriel Melillo <gabriel@melillo.me>

charts/prometheus-couchdb-exporter/Chart.yaml

@@ -3,7 +3,7 @@ appVersion: "1.0"
 description: A Helm chart to export the metrics from couchdb in Prometheus format.
 name: prometheus-couchdb-exporter
 home: https://github.com/gesellix/couchdb-prometheus-exporter
-version: 0.1.3
+version: 0.2.0
 keywords:
 - couchdb-exporter
 sources:

charts/prometheus-couchdb-exporter/templates/_helpers.tpl

@@ -40,4 +40,15 @@ Create the name of the service account to use
 {{- else -}}
     {{ default "default" .Values.serviceAccount.name }}
 {{- end -}}
-{{- end -}}
+{{- end -}}
+
+{{/*
+Return the appropriate apiVersion for rbac.
+*/}}
+{{- define "rbac.apiVersion" -}}
+{{- if .Capabilities.APIVersions.Has "rbac.authorization.k8s.io/v1" }}
+{{- print "rbac.authorization.k8s.io/v1" -}}
+{{- else -}}
+{{- print "rbac.authorization.k8s.io/v1beta1" -}}
+{{- end -}}
+{{- end -}} 

charts/prometheus-couchdb-exporter/templates/role.yaml

@@ -1,5 +1,5 @@
 {{- if .Values.rbac.create }}
-apiVersion: rbac.authorization.k8s.io/v1beta1
+apiVersion: {{ template "rbac.apiVersion" . }}
 kind: Role
 metadata:
   name: {{ template "prometheus-couchdb-exporter.fullname" . }}

charts/prometheus-couchdb-exporter/templates/rolebinding.yaml

@@ -1,5 +1,5 @@
 {{- if .Values.rbac.create -}}
-apiVersion: rbac.authorization.k8s.io/v1beta1
+apiVersion: {{ template "rbac.apiVersion" . }}
 kind: RoleBinding
 metadata:
   name: {{ template "prometheus-couchdb-exporter.fullname" . }}