Add VAD segmentation and Docker ENV defaults

bridge/Dockerfile

@@ -7,4 +7,34 @@ RUN pip install --no-cache-dir -r requirements.txt
 
 COPY app.py .
 
+# Default runtime configuration. Can be overridden with docker run -e or Portainer stack env.
+ENV WS_HOST=0.0.0.0 \
+    WS_PORT=8765 \
+    WS_PATH=/audio \
+    ECHO_ENABLED=true \
+    LOG_LEVEL=INFO \
+    MQTT_ENABLED=true \
+    MQTT_HOST=localhost \
+    MQTT_PORT=1883 \
+    MQTT_USER= \
+    MQTT_PASSWORD= \
+    MQTT_BASE_TOPIC=evs \
+    MQTT_TTS_TOPIC=evs/+/play_pcm16le \
+    MQTT_STATUS_RETAIN=true \
+    HA_WEBHOOK_URL= \
+    SAVE_SESSIONS=true \
+    SESSIONS_DIR=/data/sessions \
+    PCM_SAMPLE_RATE=16000 \
+    MAX_SESSION_BYTES=16000000 \
+    WAV_SEGMENT_MAX_BYTES=20971520 \
+    WAV_KEEP_FILES=10 \
+    VAD_ENABLED=true \
+    VAD_DIR=/data/vad \
+    VAD_KEEP_FILES=100 \
+    VAD_PREROLL_MS=1000 \
+    VAD_POSTROLL_MS=1000 \
+    VAD_START_THRESHOLD=900 \
+    VAD_STOP_THRESHOLD=600 \
+    VAD_MIN_SPEECH_MS=300
+
 CMD ["python", "app.py"]