Tweak timings of the pre-post-sync example

pre-post-sync/components/post-sync-job.yaml

@@ -11,6 +11,6 @@ spec:
       containers:
       - name: sleep
         image: alpine:latest
-        command: ["sleep", "20"]
+        command: ["sleep", "10"]
       restartPolicy: Never
   backoffLimit: 0