Add D-Bus service file

[City-busz]

And mark the application as D-Bus activatable. This allows application launchers to activate it via D-Bus.

Reference:
https://specifications.freedesktop.org/desktop-entry-spec/1.3/dbus.html

[mufeedali]

Hey @City-busz , could you let me know what use case in particular does this solve for you?

[City-busz]

This is needed for better integration with GNOME. See: https://developer.gnome.org/documentation/guidelines/maintainer/integrating.html#d-bus-activation

When DBusActivatable=true is set in the desktop file, the application launcher of GNOME Shell and KDE Plasma launches the application via D-Bus instead of fork()/exec() the executable, so the D-Bus daemon will control the process by setting up its environment, adding it to the correct cgroup, just like how usual D-Bus services work. And when the application is already running, the primary instance will receive the activation or the desired action directly.
If the service file is installed, the app can be launched via D-Bus with the following command:

gapplication launch app.drey.Dialect