Leds and buttons events (#266)

Use events and commands to control custom onboard leds and buttons. Can be used to communicate with an external Python script via a WebSocket API running in a container alongside LVA.

examples/ReSpeaker Mic Array v2.0 (USB)/Dockerfile

@@ -0,0 +1,38 @@
+FROM python:3.13-slim-bookworm
+
+ENV LANG=C.UTF-8
+ENV DEBIAN_FRONTEND=noninteractive
+ENV PYTHONUNBUFFERED=1
+
+LABEL \
+    org.opencontainers.image.title="ReSpeaker Mic Array v2.0 Peripheral Controller" \
+    org.opencontainers.image.description="LED controller for ReSpeaker Mic Array v2.0 (USB), communicating with Linux Voice Assistant" \
+    org.opencontainers.image.source="https://github.com/OHF-Voice/linux-voice-assistant"
+
+# ----------------------------------------------------------------------------
+# System packages
+#
+#   libusb-1.0-0  – required by pyusb for USB device access
+# ----------------------------------------------------------------------------
+RUN apt-get update && \
+    apt-get install --yes --no-install-recommends \
+        libusb-1.0-0 \
+        ca-certificates && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# ----------------------------------------------------------------------------
+# Python dependencies
+#
+#   websockets  – WebSocket client for LVA peripheral API
+#   pyusb       – USB vendor control transfer for LED control
+# ----------------------------------------------------------------------------
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY respeaker_usb_mic_array.py ./
+
+ENTRYPOINT ["python3", "respeaker_usb_mic_array.py"]
+CMD []