fix: FPs on docker images

[marius-benthin]

Summary of the Pull Request

Fixes false positives on official Docker images:

• golang
• postgres
• python
• redis
• ruby

Changelog

fix: Cron Pathes - filter legit cron filepathes

Example Log Event

/etc/cron.daily/apt
/etc/cron.daily/dpkg
/etc/cron.daily/passwd
/etc/crontabs/root
/etc/crontab

Fixed Issues

SigmaHQ Rule Creation Conventions

• If your PR adds new rules, please consider following and applying these conventions

[phantinuss]

Do your things @nasbench. I'll give the rule a tweak afterwards to increase coverage (more include paths) but also add the default cron jobs as filters for the distributions that I have lying around.