build

protect against SANY race conditions on the filesystem #7121

Job	Run time
compiler-warnings	2m 14s
scaladoc-check	2m 57s
docker-tests	7m 31s
build-mdbook	4s
format-check	3m 48s
integration-tests (ubuntu-latest, oopsla19)	19m 8s
unit-tests (ubuntu-latest)	5m 34s
integration-tests (ubuntu-latest, arrays)	9m 34s
unit-tests (macos-latest)	3m 33s
integration-tests (macos-latest, oopsla19)	13m 57s
	1h 8m 20s

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