Cancel in-progress/pending workflows of the same branch #747
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Concurrency setting documentation.
This PR introduces a Travis-like behavior which was cancelling any previous jobs when new changes were pushed.
This can help with modules whose acceptance tests are time consuming and stacking up workflows can lead to hit the concurrency limit pretty quickly.
A example could be the voxpupuli/puppet-zabbix module whose acceptance tests are lasting up to an hour, if a contributor pushes 5 changes we end up with ~60 jobs in the queue.
Caveats:
I haven't thought of all the cons of this change, so I'm open to discussion 😄