fix(elixir): file upload in production

- move uploads to new directory (`./uploads` per default)

config/runtime.exs

@@ -1,5 +1,9 @@
 import Config
 
+# Runtime configuration for uploads directory
+config :components_elixir,
+  uploads_dir: System.get_env("UPLOADS_DIR", "./uploads")
+
 # config/runtime.exs is executed for all environments, including
 # during releases. It is executed after compilation and before the
 # system starts, so it is typically used to load production configuration