Build for Mac os Arm 64

[hocesjc]

Please also build for Mac os Arm 64 (supported by Eclipse).

[hocesjc]

Its work with add
<environment> <os>macosx</os> <ws>cocoa</ws> <arch>aarch64</arch> </environment>
in com.eclipsesource.megit.parent/pom.xml

[planger]

Sure, I'm happy to add it if you confirm it works.
Can you please open a PR and test whether the result works for you after a local build? I have no machine to test Mac support. Thanks!