got into trouble trying to get cron to work, so not gonna touch that for now. but i was brushing up on it
i’m using debian for the docker jailmaker i believe 
which is what was the default config template for docker
the only thing i want to achieve with cron is like others suggested, to update apt, then upgrade anything for jailmaker debian and others stuff in that docker jail.
these are the instructions to set that up
this is the automated way using cron
i couldn’t get it to work. if anyone figures it out plz let me know 
this is the manual way to do it
this is the way i do it currently. manually without any cron. What i can do is, update the apt list, check what needs upgrading, then to proceed with the upgrade. thing that you would update e.g. your base like mine is debian, or apps like nano, or the nvidia toolkit, docker and whatecver else you installed into that jail for docker pretty much
note: when using the apt method, always get the update first, before upgrading any apps. this is to ensure you have the updated list. that is the rule when using apt. for pkg they always update so i read. if not mistaken people recommend using pkg over apt ideally correct me if i am wrong