MatchSpec small improvements #275

Job	Run time
Unix tests (macos-latest, debug) / Build binaries	4m 3s
Unix tests (macos-latest, release) / Build binaries	3m 19s
Unix tests (ubuntu-latest, debug) / Build binaries	1m 28s
Unix tests (ubuntu-latest, release) / Build binaries	5m 0s
Windows tests (windows-2019, release) / Build binaries	4m 25s
Unix tests (ubuntu-latest, debug) / Test libmamba Python bindings	1m 11s
Unix tests (ubuntu-latest, debug) / Test libmamba	45s
Unix tests (ubuntu-latest, debug) / Test integration micromamba	18m 9s
Windows tests (windows-2019, release) / Test libmamba Python bindings	7m 41s
Windows tests (windows-2019, release) / Test integration micromamba	42m 14s
Windows tests (windows-2019, release) / Test libmamba	2m 50s
Unix tests (ubuntu-latest, release) / Test integration micromamba	15m 58s
Unix tests (ubuntu-latest, release) / Test libmamba Python bindings	1m 6s
Unix tests (ubuntu-latest, release) / Test libmamba	44s
Unix tests (macos-latest, debug) / Test integration micromamba	48m 7s
Unix tests (macos-latest, debug) / Test libmamba Python bindings	3m 35s
Unix tests (macos-latest, debug) / Test libmamba	2m 54s
Unix tests (macos-latest, release) / Test integration micromamba	59m 35s
Unix tests (macos-latest, release) / Test libmamba Python bindings	3m 36s
Unix tests (macos-latest, release) / Test libmamba	2m 10s
	3h 48m 50s

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