fix pod disruption budget selector

Author: juliuste

kubernetes/.charts/simple-app/Chart.yaml

@@ -1,4 +1,4 @@
 apiVersion: v2
 name: simple-app
-version: 3.2.1
+version: 3.2.2
 description: Provides a deployment, service and ingress to expose one container at a given domain

kubernetes/.charts/simple-app/templates/pod-disruption-budget.yaml

@@ -10,5 +10,6 @@ metadata:
     app.kubernetes.io/managed-by: {{ .Release.Service }}
 spec:
   selector:
-    app: {{ include "app.fullName" . }}
+    matchLabels:
+      app: {{ include "app.fullName" . }}
   minAvailable: {{ .Values.minAvailable }}