Allow configuration of availability and deadline for assignments

We're working on adding a separate update ring sync schedule which would allow you do e.g. do app creations on a weekly basis, but ring advancement on a daily basis. That should address the limitation outlined by Michael and we'll mark this as shipped once we do.

This would allow some flexibly for those who want to 'Sync Weekly' but have assignments start Mid week.

Can currently do this with Update Rings (Can't create an assignmetn if you don't sync, I get it), so this would be the next best option.

Now that we have an actual Update Rings feature in PMPC Cloud, we'd love to hear what other scenario this feature would solve for you!

Replicating the "update ring" capability available in the Publisher is a must.
If you can improve it, even better!