`gh-actions/docker/cache/restore`: Rm original dir while extracting #4599

Job	Run time
gh-actions (20.x, appauth)	26s
gh-actions (20.x, dispatch)	24s
gh-actions (20.x, github/checks)	26s
gh-actions (20.x, github/mutex)	29s
gh-actions (20.x, github/script/run)	19s
gh-actions (20.x, hashfiles)	22s
gh-actions (20.x, jq)	19s
gh-actions (20.x, retest)	26s
gh-actions (20.x, torun)	18s
	3m 29s

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