Comment # 5 on bug 1115430 from Flavio Castelli

It is true that running systemd inside of an **application** container (like
one started by Docker) is tricky. However this isn't something really needed on
a daily basis. Application containers have a completely different use case from
system containers (like the ones created by LXC and LXD).

Because of that I would find really really wrong to have someone running cron
jobs inside of application containers.

I think you don't have to worry about containers (neither application, nor
system) in this discussion.