add failureThreshold to avoid restarts

deploy/values-varnish.yaml

 nameOverride: varnish-ingress
 fullnameOverride: varnish-ingress
 vikingService:
-
   ## Name of the ingress class to route through this controller
   ##
   ingressClass: varnish
@@ -9,3 +8,7 @@ vikingService:
   # labels to add to the pod container metadata
   podLabels:
     app: varnish-ingress
+
+  varnish:
+    livenessProbeConfig:
+      failureThreshold: 50