Use cert-manager to secure APIService resource

Signed-off-by: James Munnelly <james@munnelly.eu>

deploy/example-webhook/templates/apiservice.yaml

@@ -7,11 +7,12 @@ metadata:
     chart: {{ include "example-webhook.chart" . }}
     release: {{ .Release.Name }}
     heritage: {{ .Release.Service }}
+  annotations:
+    certmanager.k8s.io/inject-ca-from: "{{ .Release.Namespace }}/{{ include "example-webhook.servingCertificate" . }}"
 spec:
   group: {{ .Values.groupName }}
   groupPriorityMinimum: 1000
   versionPriority: 15
-  insecureSkipTLSVerify: true
   service:
     name: {{ include "example-webhook.fullname" . }}
     namespace: {{ .Release.Namespace }}