move unshare into chdir #361

Job	Run time
Checks (ubuntu-latest)	2m 27s
Deny	40s
Checks (macos-latest)	1m 52s
Linux Integration (ubuntu-20.04, v1.6.28)	3m 54s
Tests (ubuntu-latest)	15m 14s
Linux Integration (ubuntu-20.04, v1.7.13)	4m 10s
Tests (macos-latest)	2m 9s
Timings	1m 39s
Linux Integration (ubuntu-20.04, v2.0.0-beta.2)	4m 26s
Tests (windows-latest)	4m 33s
Windows Checks	3m 50s
Linux Integration (ubuntu-22.04, v1.6.28)	4m 19s
Windows Integration (windows-latest, 1.7.0)	4m 52s
Linux Integration (ubuntu-22.04, v1.7.13)	4m 18s
Linux Integration (ubuntu-22.04, v2.0.0-beta.2)	4m 28s
Report required job statuses	1s
	1h 2m 52s

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