add supervisord image build

docker/supervisord/Dockerfile

@@ -0,0 +1,11 @@
+FROM debian:13.5
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt update && apt install -y --no-install-recommends\
+    supervisor \
+    && rm -rf /var/lib/apt/lists/*
+
+ADD --chmod=755 entrypoint.sh /
+
+ENTRYPOINT ["/entrypoint.sh"]

docker/supervisord/entrypoint.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+WORKSPACE=/workspace
+CONF=$WORKSPACE/supervisord.conf
+
+[[ -f "$CONF" ]] || (echo_supervisord_conf > $CONF )
+
+exec supervisord -n -c $CONF "$@"