Tests

Refactor env::which #148

Job	Run time
Unix tests (macos-latest, debug) / Build binaries	2m 37s
Unix tests (macos-latest, release) / Build binaries	8m 4s
Unix tests (ubuntu-latest, debug) / Build binaries	1m 51s
Unix tests (ubuntu-latest, release) / Build binaries	2m 4s
Windows tests (windows-2019, release) / Build binaries	5m 14s
Unix tests (ubuntu-latest, debug) / Test integration micromamba	17m 44s
Unix tests (ubuntu-latest, debug) / Test libmamba Python bindings	1m 3s
Unix tests (ubuntu-latest, debug) / Test libmamba	47s
Unix tests (ubuntu-latest, release) / Test libmamba	50s
Unix tests (ubuntu-latest, release) / Test libmamba Python bindings	58s
Unix tests (ubuntu-latest, release) / Test integration micromamba	15m 24s
Unix tests (macos-latest, debug) / Test integration micromamba	55m 33s
Unix tests (macos-latest, debug) / Test libmamba	2m 4s
Unix tests (macos-latest, debug) / Test libmamba Python bindings	3m 7s
Windows tests (windows-2019, release) / Test integration micromamba	43m 59s
Windows tests (windows-2019, release) / Test libmamba	5m 38s
Windows tests (windows-2019, release) / Test libmamba Python bindings	3m 47s
Unix tests (macos-latest, release) / Test libmamba	3m 27s
Unix tests (macos-latest, release) / Test libmamba Python bindings	2m 23s
Unix tests (macos-latest, release) / Test integration micromamba	55m 24s
	3h 51m 58s

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