A way to hide a dock icon

[Gozala]

I would like to write a systray app that does not have dock presence, in other words equivalent of app.dock.hide() in electron.

Is that possible in any way ?

[Gozala]

Related to kusti8/proton-native#189

[mischnic]

For macOS: https://developer.apple.com/documentation/appkit/nsapplicationactivationpolicy?language=objc