add back support for ingress in k8s < 1.14 (#20591)

Signed-off-by: George Kaz <egeorgekaz@gmail.com>

stable/drone/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 name: drone
 home: https://drone.io/
 icon: https://drone.io/apple-touch-icon.png
-version: 2.6.0
+version: 2.6.1
 appVersion: 1.6.1
 description: Drone is a Continuous Delivery system built on container technology
 keywords:

stable/drone/templates/_helpers.tpl

@@ -69,3 +69,14 @@ Create the name of the secret for an enterprise license key
   {{ printf "%s-%s" (include "drone.fullname" .) "license-key" | trunc 63 }}
 {{- end -}}
 {{- end -}}
+
+{{/*
+Return the appropriate apiVersion for ingress.
+*/}}
+{{- define "drone.ingress.apiVersion" -}}
+{{- if semverCompare "<1.14-0" .Capabilities.KubeVersion.GitVersion -}}
+{{- print "extensions/v1beta1" -}}
+{{- else if semverCompare "^1.14-0" .Capabilities.KubeVersion.GitVersion -}}
+{{- print "networking.k8s.io/v1beta1" -}}
+{{- end -}}
+{{- end -}}

stable/drone/templates/ingress.yaml

@@ -1,7 +1,7 @@
 {{- if .Values.ingress.enabled -}}
 {{- $fullName := include "drone.fullname" . }}
 {{- $httpPort := .Values.service.httpPort }}
-apiVersion: networking.k8s.io/v1beta1
+apiVersion: {{ template "drone.ingress.apiVersion" . }}
 kind: Ingress
 metadata:
   annotations: