runner: allow subdirectories in --folder

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- The runner `--folder` argument now supports downloading files from
+  subdirectories.
+
 ### Fixed
 
 - Fixed an issue where `RimeHttpTTSService` and `PiperTTSService` could generate

src/pipecat/runner/run.py

@@ -217,7 +217,7 @@ def _setup_webrtc_routes(
         """Redirect root requests to client interface."""
         return RedirectResponse(url="/client/")
 
-    @app.get("/files/{filename}")
+    @app.get("/files/{filename:path}")
     async def download_file(filename: str):
         """Handle file downloads."""
         if not folder: