build proper dockerized example

docker/entrypoint-example.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -e 
+
+sudo cron -f &
+sleep 1
+sudo ps | grep cron 1>/dev/null
+echo "[+] cron started"
+
+echo "[+] Running as user `id`"
+
+echo "[+] Starting pspy now..."
+pspy 2>/dev/null