Test installation

fix: websocket messages using flask were sometimes corrupted. #1514

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Run time

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Job	Run time
call-workflow-build / build	58s
install (ubuntu, 3.6)	43s
install (ubuntu, 3.10)	40s
install (macos, 3.6)	1m 26s
install (macos, 3.10)	1m 8s
install (windows, 3.10)	2m 13s
	7m 8s