[ingress] allow api-version spec

Author: tony-kerz

templates/server-ingress.yaml

@@ -7,11 +7,15 @@
 {{- $serviceName = printf "%s-%s" $serviceName "active" -}}
 {{- end }}
 {{- $servicePort := .Values.server.service.port -}}
+{{ if .Values.server.ingress.apiVersion }}
+apiVersion: {{ .Values.server.ingress.apiVersion }}
+{{ else }}
 {{ if .Capabilities.APIVersions.Has "networking.k8s.io/v1beta1" }}
 apiVersion: networking.k8s.io/v1beta1
 {{ else }}
 apiVersion: extensions/v1beta1
-{{ end }}
+{{ end }} {{- /* capabilities */}}
+{{ end }} {{- /* apiVersion */}}
 kind: Ingress
 metadata:
   name: {{ template "vault.fullname" . }}