[FreshRSS] should have cron env set

[falkheiland]

https://github.com/FreshRSS/FreshRSS/blob/edge/Docker/README.md#option-1-cron-inside-the-freshrss-docker-image

'CRON_MIN=13,43'

maybe even as multi-select formfield with some options:

• 5,15,25,35,45,55
• 5,20,35,50
• 5,35
• 5

[falkheiland]

this seems to be a problem only with my installation, since i take the original feshrss image. the linuxserver one has an inbuilt cron job

https://github.com/linuxserver/docker-freshrss/blob/master/root/etc/crontabs/abc