flatpak: set debug as log level by default

build-aux/org.gnome.TourDevel.json

@@ -11,7 +11,8 @@
         "--share=ipc",
         "--socket=fallback-x11",
         "--socket=wayland",
-        "--device=dri"
+        "--device=dri",
+        "--env=RUST_LOG=gnome_tour=debug"
     ],
     "build-options": {
         "append-path": "/usr/lib/sdk/rust-stable/bin",
@@ -34,4 +35,4 @@
             ]
         }
     ]
-}
\ No newline at end of file
+}