...or clair-whitelist.yml

* Try to prevent the container from restarting all the time by adding 
`-f` to `crond`
* `touch /crontab.conf` not needed
* `cat /crontab.conf` not needed because `start-rotation.py` already 
prints the config

/etc/crontab does not exist in Alpine. No idea why the `touch 
/crontab.conf` was added.

... and CVE-2019-17455 from clair-whitelist.yml.

These three vulnerabilities seem to be fixed with the new Alpine image