fix: pdb selector by component (#21654)

Signed-off-by: Sergio Millan Rodriguez <sergio.rodriguez@ticketmaster.co.uk>

stable/nginx-ingress/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: nginx-ingress
-version: 1.34.2
+version: 1.34.3
 appVersion: 0.30.0
 home: https://github.com/kubernetes/ingress-nginx
 description: An nginx Ingress controller that uses ConfigMap to store the nginx configuration.

stable/nginx-ingress/templates/controller-poddisruptionbudget.yaml

@@ -5,7 +5,7 @@ metadata:
   labels:
     app: {{ template "nginx-ingress.name" . }}
     chart: {{ template "nginx-ingress.chart" . }}
-    component: "{{ .Values.controller.name }}"
+    app.kubernetes.io/component: controller
     heritage: {{ .Release.Service }}
     release: {{ .Release.Name }}
   name: {{ template "nginx-ingress.controller.fullname" . }}
@@ -14,6 +14,8 @@ spec:
     matchLabels:
       app: {{ template "nginx-ingress.name" . }}
       release: {{ .Release.Name }}
-      component: "{{ .Values.controller.name }}"
+      {{- if .Values.controller.useComponentLabel }}
+      app.kubernetes.io/component: controller
+      {{- end }}
   minAvailable: {{ .Values.controller.minAvailable }}
 {{- end }}