Very lightweight cron image of only 1.59MB, based on alpine but stripped to the minimum and runs as non-root user.
Just add your scripts to one of the following directories:
/etc/periodic/min/etc/periodic/5min/etc/periodic/10min/etc/periodic/15min/etc/periodic/30min/etc/periodic/hourly/etc/periodic/daily/etc/periodic/weekly/etc/periodic/monthly/etc/periodic/yearly
You may define environment variable CRON_DEBUG to a value higher than the default 0 to increase debug level up to 8.
Everything is logged to docker, including the output of the cron jobs.
To test it with teh included demo sample script, just run docker-compose up.