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Add `justfile` as a project workflow interface #395

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Run time

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Job	Run time
Test (release, ubuntu-latest)	5m 46s
Web Platform Tests (release)	6m 53s
Test (weval, ubuntu-latest)	4m 8s
Web Platform Tests (debug)	7m 10s
Web Platform Tests (weval)	4m 40s
	28m 37s