build

protect against SANY race conditions on the filesystem #7120

Job	Run time
build-mdbook	5s
docker-tests	7m 9s
format-check	3m 52s
compiler-warnings	2m 10s
integration-tests (ubuntu-latest, oopsla19)	19m 14s
scaladoc-check	2m 58s
integration-tests (ubuntu-latest, arrays)	9m 16s
unit-tests (ubuntu-latest)	5m 14s
integration-tests (macos-latest, oopsla19)	15m 0s
unit-tests (macos-latest)	5m 3s
	1h 10m 1s

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