Test caching #182

Job	Run time
Test download cache 1/2 (windows-latest)	1m 7s
Test download cache 1/2 (ubuntu-latest)	50s
Test download cache 1/2 (macos-latest)	1m 23s
Test env cache 1/2 (windows-latest)	1m 10s
Test env cache 1/2 (ubuntu-latest)	33s
Test env cache 1/2 (macos-latest)	1m 10s
Test env then download 1/2 (windows-latest)	1m 29s
Test env then download 1/2 (ubuntu-latest)	38s
Test env then download 1/2 (macos-latest)	58s
Test env cache 2/2 (windows-latest)	28s
Test env cache 2/2 (ubuntu-latest)	9s
Test env cache 2/2 (macos-latest)	24s
Test download cache 2/2 (windows-latest)	59s
Test download cache 2/2 (ubuntu-latest)	14s
Test download cache 2/2 (macos-latest)	1m 1s
Test env then download 2/2 (windows-latest)	28s
Test env then download 2/2 (ubuntu-latest)	5s
Test env then download 2/2 (macos-latest)	18s
	13m 24s

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