Release crown-qt as .dmg on macOS
On macOS, most apps are released as a .dmg-file, which can be mounted as a disk image and the application within can then be moved to the applications folder. The electrum-crown wallet does the same.
Currently the wallet release is a zip-file with a bin and lib folder, which I have noticed some people struggle with figuring out. Having a .dmg is not necessary, but it is easier to understand for many people on macOS since it's how they are used to installing apps.