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Limit CI concurrency to one per PR, redux
This PR should only be merged after CI pipeline considered stable again. This PR reverts cloudberrydb/cloudberrydb#258.
In current workflow, when newer commit comes, old pipeline won't get canceled, which wastes resources and cause unnecessary CI failure emails. This PR limits concurrency to one per PR. when newer commit comes, stale CI jobs will be automatically cancelled.
See: https://stackoverflow.com/a/72408109/8711684