Setup static single robot account for job service ScanAll

[rekha-prakash-maersk]

Hello,

I have weekly scan that scans some half million artifacts. So noticing in the logs that job services deletes a unique token after scanning each artifact. I understand that this unique robot provide enhanced security. But I like to know is there any option I can provide a system robot secret that can be used for pulling images during the scan job ?

I assume it would reduce load on other components while creating and deleting each robots.

[MinerYang]

dup of #21928