Describe the bug

safe_sleep.sh is built as while loop aiming to be safer than count on sleep or ping binaries. While loop the way function was implemented leads to 100% CPU usage without try another alternatives (Eg. Testing if sleep is available).

To Reproduce
Steps to reproduce the behavior:

1. Start runner
2. Wait

Expected behavior

A lesser CPU usage from runner while idle.

Actual behavior

Runner Version and Platform

Linux 2.300.2 running on Docker.