How do you create a Golang executable that doesn't open a terminal window on OSX?
There's a similar question here for Windows. How do I create an executable from Golang that doesn't open a command (cmd) window when run?
Probably, you just need to pack your executable in application bundle. It's just a directory with .app extension where executable, resources and configs (plist-files) are stored.
You can read all specs at developer.apple.com. Also you can open bundles with your existing apps and look what's inside.