Enable dual audio input channel (#334)

This PR adds the ability to choose the microphone stream that works best with a particular STT engine using the new dual audio input channel feature.

docker-entrypoint.sh

@@ -52,6 +52,10 @@ if [ -n "${MIC_NOISE_SUPPRESSION}" ]; then
   EXTRA_ARGS+=( "--mic-noise-suppression" "$MIC_NOISE_SUPPRESSION" )
 fi
 
+if [ -n "${AUDIO_INPUT_CHANNELS}" ]; then
+  EXTRA_ARGS+=( "--audio-input-channels" "$AUDIO_INPUT_CHANNELS" )
+fi
+
 if [ "$ENABLE_THINKING_SOUND" = "1" ]; then
   EXTRA_ARGS+=( "--enable-thinking-sound" )
 fi