add muse2 main branch install to ci #87

Job	Run time
Latest MUSE2 release / Run Pytest (windows-latest, 3.14, muse2.exe)	1m 9s
Latest MUSE2 release / Run Pytest (ubuntu-latest, 3.14, muse2)	31s
Current MUSE2 main branch / Run Pytest (windows-latest, 3.14, muse2.exe)	5m 13s
Current MUSE2 main branch / Run Pytest (ubuntu-latest, 3.14, muse2)	3m 8s
Current MUSE2 main branch / Run Pytest (macos-latest, 3.14, muse2)	3m 48s
Latest MUSE2 release / Run Pytest (macos-latest, 3.14, muse2)	37s
	14m 26s

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