Cancel current run when future queued workflows available

[prempalsingh]

Please describe your suggestion: 提案の概要

In the scenario when the CI system is saturated and workflows get scheduled, auto cancel does not work as it only checks for in-progress runs that were created before the current run. The runs don't get canceled as long as the future workflow runs are in the queued state.

Describe the solution you'd like: 考えうる解決方法

It would be good to have an option to cancel all workflows but the latest one for a given workflow id. This can either be a default behaviour or can be enabled using a flag.

[welcome]

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[technote-space]

I've added the feature as a default behavior.
Please use v1, v1.7 or v1.7.0.