Add support for ingressClassName (#217)

Hi,

I just add some minor changes to support specifying ingressClassName to support the newer specification in `networking.k8s.io/v1`. The annotation `kubernetes.io/ingress.class: nginx` only works with older API `networking.k8s.io/v1beta1`.

This is part of our move to support kubernetes 1.22.

Co-authored-by: Leong Wai Kit <waikit.leong@bertelsmann.de>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/217
Reviewed-by: luhahn <luhahn@noreply.gitea.io>
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: wkit23 <wkit23@noreply.gitea.io>
Co-committed-by: wkit23 <wkit23@noreply.gitea.io>

README.md

@@ -508,7 +508,8 @@ Annotations can be added to the Gitea pod.
 |ingress.hosts[0].host | add hosts for ingress | git.example.com |
 |ingress.hosts[0].paths[0].path | add path for each ingress host | / |
 |ingress.hosts[0].paths[0].pathType | add ingress path type | Prefix |
-|ingress.tls|add ingress tls settings|[]|
+|ingress.tls| add ingress tls settings|[]|
+|ingress.className| add ingress class name. Only used in k8s 1.19+ | |
 
 ### Service
 

templates/gitea/ingress.yaml

@@ -18,6 +18,9 @@ metadata:
     {{- toYaml . | nindent 4 }}
   {{- end }}
 spec:
+{{- if .Values.ingress.className }}
+  ingressClassName: {{ .Values.ingress.className }}
+{{- end }}
 {{- if .Values.ingress.tls }}
   tls:
   {{- range .Values.ingress.tls }}

values.yaml

@@ -57,6 +57,7 @@ service:
 
 ingress:
   enabled: false
+  # className: nginx
   annotations: {}
     # kubernetes.io/ingress.class: nginx
     # kubernetes.io/tls-acme: "true"