build

protect against SANY race conditions on the filesystem #7118

Job	Run time
build-mdbook	3s
compiler-warnings	2m 17s
format-check	3m 43s
docker-tests	7m 7s
integration-tests (ubuntu-latest, oopsla19)	19m 31s
scaladoc-check	3m 3s
integration-tests (ubuntu-latest, arrays)	9m 4s
unit-tests (ubuntu-latest)	5m 9s
unit-tests (macos-latest)	3m 30s
integration-tests (macos-latest, oopsla19)	15m 46s
	1h 9m 13s

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