make application runnable under flatpak, correct permission missing

meson.build

@@ -0,0 +1,26 @@
+project('toolbx-tuner', 'rust', 
+          version: '0.1.0',
+    meson_version: '>= 0.59.0',
+  default_options: [ 'warning_level=2',
+                     'werror=false',
+                   ],
+)
+
+i18n = import('i18n')
+
+gnome = import('gnome')
+
+
+cargo_sources = files(
+  'Cargo.toml',
+  'Cargo.lock',
+)
+
+subdir('data')
+subdir('src')
+
+gnome.post_install(
+  glib_compile_schemas: true,
+  gtk_update_icon_cache: true,
+  update_desktop_database: true,
+)