Better heuristic for the host name

run.exs

@@ -1,6 +1,8 @@
 host =
   if repo_name = System.get_env("SPACE_REPO_NAME") do
-    "#{System.get_env("SPACE_AUTHOR_NAME")}-#{String.replace(repo_name, "_", "-")}.hf.space"
+    "#{System.get_env("SPACE_AUTHOR_NAME")}-#{repo_name}.hf.space"
+    |> String.replace("_", "-")
+    |> String.downcase(:ascii)
   else
     "localhost"
   end