[Nexus] Add a Nexus cleanup task

Cleanup tasks helps us keeping Nexus disk usage low, specially for projects where they store daily Jenkins logs

and daily snapshot and staging artifacts.



To add a new cleanup tasks, go to <nexus URL> → Administration → Scheduled Tasks


Nexus has several type of Cleanup and other recurrent tasks:

https://help.sonatype.com/repomanager2/configuration/managing-scheduled-tasks