Fix: application timeout in fast-track if only 1 gpu available (#151)

* Fix: application timeout in fast-track if only 1 gpu

* Fix: reply to message so bot 'stops thinking'

src/discord-cluster-manager/cogs/leaderboard_cog.py

@@ -102,9 +102,6 @@ async def select_gpu_view(
         """
         UI displayed to user to select GPUs that they want to use.
         """
-        if not interaction.response.is_done():
-            await interaction.response.defer(ephemeral=True)
-
         view = GPUSelectionView(gpus)
 
         await send_discord_message(
@@ -200,7 +197,14 @@ async def on_submit_hook(
 
         # if there is more than one candidate GPU, display UI to let user select,
         # otherwise just run on that GPU
+        if not interaction.response.is_done():
+            await interaction.response.defer(ephemeral=True)
         if len(gpus) == 1:
+            await send_discord_message(
+                interaction,
+                f"Running on GPU: **{gpus[0]}**",
+                ephemeral=True,
+            )
             selected_gpus = gpus
         else:
             view = await self.select_gpu_view(interaction, leaderboard_name, gpus)