snapcraft.yaml: Add the url-handler

resources/linux/snap/snapcraft.yaml

@@ -51,6 +51,13 @@ apps:
   @@NAME@@:
     command: electron-launch $SNAP/usr/share/@@NAME@@/bin/@@NAME@@
     desktop: usr/share/applications/@@NAME@@.desktop
+    environment:
+      DISABLE_WAYLAND: 1
+      GSETTINGS_SCHEMA_DIR: $SNAP/usr/share/glib-2.0/schemas
+
+  url-handler:
+    command: electron-launch $SNAP/usr/share/@@NAME@@/bin/@@NAME@@ --open-url
+    desktop: usr/share/applications/@@NAME@@-url-handler.desktop
     environment:
       DISABLE_WAYLAND: 1
       GSETTINGS_SCHEMA_DIR: $SNAP/usr/share/glib-2.0/schemas
\ No newline at end of file