add streaming and mobile-app instructions

icecast/Dockerfile

@@ -0,0 +1,23 @@
+FROM debian:bookworm-slim
+
+RUN apt-get update \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+        icecast2 \
+        gettext-base \
+        apache2-utils \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY icecast.xml.template /etc/icecast2/icecast.xml.template
+
+EXPOSE 8000
+
+HEALTHCHECK --interval=10s --timeout=5s --start-period=5s \
+    CMD curl -fsS http://localhost:8000/ > /dev/null || exit 1
+
+CMD ["/bin/sh", "-c", "\
+  envsubst '${ICECAST_SOURCE_PASSWORD}${ICECAST_RELAY_PASSWORD}${ICECAST_ADMIN_PASSWORD}' \
+    < /etc/icecast2/icecast.xml.template > /etc/icecast2/icecast.xml \
+  && htpasswd -cb /etc/icecast2/listeners.htpasswd \
+       listener \"${ICECAST_LISTENER_PASSWORD:-groove_listen}\" \
+  && exec icecast2 -c /etc/icecast2/icecast.xml"]