Create Mac Native app release

[Kohulan]

The mac version of Java has a command line app called jpackage which builds native Mac Apps. If you are in the folder of the fat mortar jar, all you need to do is:

jpackage -i . -n Mortar --icon mortar.icns --main-jar MORTAR-fat-aarch64-1.2.0.0-beta.jar

Note: Make sure Java 21 installed when you build it.

[JonasSchaub]

Todo:

• add this to the "how to create a release" instructions
• add the Mac app icon file to the repo
• add a description of this to the "installation" sections in readme and tutorial

[JonasSchaub]

jpackage -i . -n MORTAR --icon MORTAR-icon.icns --main-jar MORTAR-fat-aarch64-1.2.0.0.jar