feat: add networking.k8s.io/v1 support to ingress template

Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>

pkg/chartutil/create.go

@@ -147,16 +147,15 @@ service:
 
 ingress:
   enabled: false
+  className: ""
   annotations: {}
     # kubernetes.io/ingress.class: nginx
     # kubernetes.io/tls-acme: "true"
   hosts:
     - host: chart-example.local
       paths:
-      - path: /
-        backend:
-          serviceName: chart-example.local
-          servicePort: 80
+        - path: /
+          pathType: ImplementationSpecific
   tls: []
   #  - secretName: chart-example-tls
   #    hosts:
@@ -216,7 +215,14 @@ const defaultIgnore = `# Patterns to ignore when building packages.
 const defaultIngress = `{{- if .Values.ingress.enabled -}}
 {{- $fullName := include "<CHARTNAME>.fullname" . -}}
 {{- $svcPort := .Values.service.port -}}
-{{- if semverCompare ">=1.14-0" .Capabilities.KubeVersion.GitVersion -}}
+{{- if and .Values.ingress.className (not (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion)) }}
+  {{- if not (hasKey .Values.ingress.annotations "kubernetes.io/ingress.class") }}
+  {{- $_ := set .Values.ingress.annotations "kubernetes.io/ingress.class" .Values.ingress.className}}
+  {{- end }}
+{{- end }}
+{{- if semverCompare ">=1.19-0" .Capabilities.KubeVersion.GitVersion -}}
+apiVersion: networking.k8s.io/v1
+{{- else if semverCompare ">=1.14-0" .Capabilities.KubeVersion.GitVersion -}}
 apiVersion: networking.k8s.io/v1beta1
 {{- else -}}
 apiVersion: extensions/v1beta1
@@ -231,6 +237,9 @@ metadata:
     {{- toYaml . | nindent 4 }}
   {{- end }}
 spec:
+  {{- if and .Values.ingress.className (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion) }}
+  ingressClassName: {{ .Values.ingress.className }}
+  {{- end }}
   {{- if .Values.ingress.tls }}
   tls:
     {{- range .Values.ingress.tls }}
@@ -248,12 +257,22 @@ spec:
         paths:
           {{- range .paths }}
           - path: {{ .path }}
+            {{- if and .pathType (semverCompare ">=1.18-0" $.Capabilities.KubeVersion.GitVersion) }}
+            pathType: {{ .pathType }}
+            {{- end }}
             backend:
+              {{- if semverCompare ">=1.19-0" $.Capabilities.KubeVersion.GitVersion }}
+              service:
+                name: {{ $fullName }}
+                port:
+                  number: {{ $svcPort }}
+              {{- else }}
               serviceName: {{ $fullName }}
               servicePort: {{ $svcPort }}
+              {{- end }}
           {{- end }}
     {{- end }}
-  {{- end }}
+{{- end }}
 `
 
 const defaultDeployment = `apiVersion: apps/v1