Smoke

Support external manifest repositories #27

Job	Run time
ubuntu-latest / internal / copy	46s
ubuntu-latest / external / copy	34s
ubuntu-latest / internal / symlink	35s
windows-latest / internal / symlink	53s
windows-latest / internal / copy	1m 6s
ubuntu-latest / external / hardlink	34s
ubuntu-latest / external / symlink	34s
windows-latest / external / hardlink	1m 15s
windows-latest / external / symlink	1m 13s
ubuntu-latest / internal / hardlink	33s
windows-latest / internal / hardlink	53s
windows-latest / external / copy	50s
	9m 46s

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