dch-webhooks: Disable HTTPS redirect

The [Generic Event][0] plugin for Jenkins does not support HTTPS
webhooks, only plain HTTP.

[0]: https://plugins.jenkins.io/generic-event/

dch-webhooks/ingress.yaml

@@ -2,6 +2,8 @@
 apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
+  annotations:
+    nginx.ingress.kubernetes.io/ssl-redirect: "false"
   labels:
     app.kubernetes.io/name: dch-webhooks
     app.kubernetes.io/component: dch-webhooks