helm: check for contents of bootstartFile

Checking for the existence of the .Values.nodeinit.bootstrapFile
file will be a no-op because the file is created by kubelet if
it does not exist. Instead, we should check if the file has some
contents inside of it which is when we can be sure the node-init
DaemonSet has started.

Signed-off-by: André Martins <andre@cilium.io>

install/kubernetes/cilium/templates/cilium-agent/daemonset.yaml

@@ -372,7 +372,7 @@ spec:
         - sh
         - -c
         - |
-          until test -f {{ .Values.nodeinit.bootstrapFile | quote }}; do
+          until test -s {{ .Values.nodeinit.bootstrapFile | quote }}; do
             echo "Waiting on node-init to run...";
             sleep 1;
           done