Consistently only conditionally install tools in soundness checks #77

Job	Run time
Soundness / Documentation check	40s
Soundness / License headers check	3s
Soundness / Unacceptable language check	3s
Soundness / API breakage check	0s
Soundness / Broken symlinks check	3s
Soundness / Shell check	39s
Soundness / YAML lint check	4s
Soundness / Format check	0s
Soundness / Python lint check	5s
	1m 37s

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