New branch v3 that defaults to `alr 2.0` #44

Job	Run time
setup-alire (ubuntu-latest, stable)	26s
setup-alire (ubuntu-latest, nightly)	31s
setup-alire (ubuntu-latest, source)	6m 25s
setup-alire (macos-latest, stable)	36s
setup-alire (macos-latest, nightly)	49s
setup-alire (macos-latest, source)	5m 41s
setup-alire (windows-latest, stable)	3m 13s
setup-alire (windows-latest, nightly)	3m 20s
setup-alire (windows-latest, source)	7m 2s
	28m 3s

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