Purpose/why for preemptible_and_regular_instance_templates module

[mafrosis]

A five minute click around and read of the docs suggests that preemptible_and_regular_instance_templates module exists because the normal instance_template module can be only preemptible or regular, but not both.

Is this correct? I would suggest it's worth adding "why would I use this" to all the modules README very close to the top 😄

[morgante]

Yes, the idea is to be able to have a workload defined once but deployed using a mix of preemptible and regular VMs.

Agreed that we can add more value/usage info to the README. Happy to accept a PR.

[github-actions]

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