Fix audio in headless containers with ALSOFT_DRIVERS=null

OpenAL needs an audio backend to render sound into buffers. In containers
without audio hardware, it silently fails. Setting ALSOFT_DRIVERS=null
tells OpenAL-soft to use its null output driver, allowing ViZDoom to
capture audio into buffers for WebSocket streaming.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ilya-zakirzyanov

setup.sh

@@ -35,5 +35,6 @@ echo "==> Building client..."
 npx vite build --outDir ../dist 2>/dev/null
 
 # Start production server (single process, no proxy overhead)
+# ALSOFT_DRIVERS=null lets OpenAL render audio in headless containers without real audio hardware
 echo "==> Starting server on port 3000..."
-IS_PRODUCTION=true python3 server.py
+ALSOFT_DRIVERS=null IS_PRODUCTION=true python3 server.py