Running ruby sript with Cron in Centos7 Docker image

I've setup a cron job in my centos7 docker image but its not working

crontab -e
    >> * * * * * ruby myrubyfile.rb

This same cron job is working on my actual centos7 machine.

Copyright Notice：Content Author:「Eamonn McEvoy」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/32604126/running-ruby-sript-with-cron-in-centos7-docker-image

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