Add msys2 option #140

Job	Run time
setup-alire (macos-12, nightly, false)	27s
setup-alire (macos-12, source, false)	3m 58s
setup-alire (macos-12, stable, false)	31s
setup-alire (macos-14, nightly, false)	21s
setup-alire (macos-14, source, false)	2m 22s
setup-alire (macos-14, stable, false)	21s
setup-alire (macos-latest, nightly, true)	22s
setup-alire (macos-latest, nightly, false)	21s
setup-alire (macos-latest, source, true)	2m 25s
setup-alire (macos-latest, source, false)	2m 26s
setup-alire (macos-latest, stable, true)	21s
setup-alire (macos-latest, stable, false)	22s
setup-alire (ubuntu-latest, nightly, false)	20s
setup-alire (ubuntu-latest, source, false)	3m 23s
setup-alire (ubuntu-latest, stable, false)	18s
setup-alire (windows-latest, nightly, true)	2m 26s
setup-alire (windows-latest, nightly, false)	1m 20s
setup-alire (windows-latest, source, true)	5m 54s
setup-alire (windows-latest, source, false)	4m 42s
setup-alire (windows-latest, stable, true)	2m 55s
setup-alire (windows-latest, stable, false)	1m 20s
	36m 55s

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