build

protect against SANY race conditions on the filesystem #7124

Job	Run time
scaladoc-check	2m 52s
compiler-warnings	2m 5s
build-mdbook	5s
format-check	3m 51s
integration-tests (ubuntu-latest, oopsla19)	19m 47s
docker-tests	7m 13s
integration-tests (ubuntu-latest, arrays)	10m 49s
unit-tests (ubuntu-latest)	4m 55s
integration-tests (macos-latest, oopsla19)	14m 24s
unit-tests (macos-latest)	4m 12s
	1h 10m 13s

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