Bump ingress api version to networking.k8s.io/v1 (#2809)

extensions/v1beta1 Ingress is deprecated in v1.14+, unavailable in v1.22+
ref to: https://kubernetes.io/docs/reference/using-api/deprecation-guide/#ingress-v122

Signed-off-by: JenTing Hsiao <jenting.hsiao@suse.com>

Co-authored-by: David Ko <dko@suse.com>

chart/templates/ingress.yaml

@@ -1,5 +1,9 @@
 {{- if .Values.ingress.enabled }}
-apiVersion: extensions/v1beta1
+{{- if semverCompare ">=1.19-0" .Capabilities.KubeVersion.GitVersion -}}
+apiVersion: networking.k8s.io/v1
+{{- else -}}
+apiVersion: networking.k8s.io/v1beta1
+{{- end }}
 kind: Ingress
 metadata:
   name: longhorn-ingress
@@ -14,7 +18,7 @@ metadata:
     {{ $key }}: {{ $value | quote }}
     {{- end }}
 spec:
-  {{- if .Values.ingress.ingressClassName }}
+  {{- if and .Values.ingress.ingressClassName (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion) }}
   ingressClassName: {{ .Values.ingress.ingressClassName }}
   {{- end }}
   rules:
@@ -22,9 +26,19 @@ spec:
     http:
       paths:
         - path: {{ default "" .Values.ingress.path }}
+          {{- if (semverCompare ">=1.18-0" $.Capabilities.KubeVersion.GitVersion) }}
+          pathType: ImplementationSpecific
+          {{- end }}
           backend:
+            {{- if semverCompare ">=1.19-0" $.Capabilities.KubeVersion.GitVersion }}
+            service:
+              name: longhorn-frontend
+              port:
+                number: 80
+            {{- else }}
             serviceName: longhorn-frontend
             servicePort: 80
+            {{- end }}
 {{- if .Values.ingress.tls }}
   tls:
   - hosts: