As a user I have automatic syncs for repos so I can stay up-to-date with the remote registry

[ipanova]

Is your feature request related to a problem? Please describe.
Enable periodic repo syncing with an upstream registry based on time intervals.
This can potentially be enabled via a periodic task. Remote should be present on the repo in that case.

We can think of whether enable simple periodic sync tasks or introduce a periodic job that will be checking first whether remote repo(s) have changed and trigger sync task respectively.

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[lubosmj]

It makes sense to implement this in pulpcore.

We have a facility for dispatching periodic tasks, as mentioned here: #1268 (comment).

[lubosmj]

So, we can use the post-migrate hook that will create a task which periodically runs in the background, inspects repositories with remotes attached, and runs a sync task if the frequency conditions are met. We would need to add another field to the repository model -- "sync_frequency".