build: automatically cancel old tests/build on new push #376
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Currently, whenever you push any commit to your branch, the old builds are still running and a new build is started. Once a new commit is added, the old test results no longer matter and it's just a waste of CI resources. Also reduces confusion with multiple builds running in parallel for the same branch/possibly blocking any merges.
With this little change, we ensure that whenever a new commit is added, the previous build is immediately canceled/stopped and only the build (latest commit) runs.