Flaky test: TestBuildCancellationKillsSleep #18674
Description
From #18661 on Windows:
----------------------------------------------------------------------
FAIL: docker_cli_build_test.go:1874: DockerSuite.TestBuildCancellationKillsSleep
docker_cli_build_test.go:1945:
c.Fatal("failed to observe build container start in timely fashion")
... Error: failed to observe build container start in timely fashion
----------------------------------------------------------------------