chore: added concurrency group to the pr workflow to automatically cancel previous workflow #2066
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This is supposed to be another update for sustainability and optimising resources. I noticed when I pushed two subsequent changes, the previous workflow keep running. As can be seen in the actions list below.
I have added concurrency to
pr.yml
to stop the previous workflow.I have tested it as well and it work fine. This can be verified from the the actions list.

The workflow associated with the latest commit will run and jobs from the previous commit will automatically be cancelled.
