cron - Docker mod for any container

This mod adds cron to any container, to be installed/updated during container start.

In any container docker arguments, set an environment variable DOCKER_MODS=linuxserver/mods:universal-cron

If adding multiple mods, enter them in an array separated by |, such as DOCKER_MODS=linuxserver/mods:universal-cron|linuxserver/mods:universal-mod2

This mod will ensure you have a /config/crontabs/root file where you can add cron jobs to run inside the container.

No cron jobs (aside from what may be included in the base OS) are included by default.

You can test to confirm things are working by adding the following line to /config/crontabs/root

*/5 * * * *    /bin/echo test >> /config/tmp.txt

Then restart the container and wait 5 minutes to see that the test completes. Remove the test and restart the container after confirming.