ring-mqtt v5 needs /data/config.json or it exits immediately — so "always on"
crashed. gen-passwd.sh now generates docker/ring-mqtt/config.json (the broker
mqtt_url for the least-privileged `ring` user), bind-mounted read-only into the
bridge; the token/state stays in the ring-data volume. config.json is gitignored
(has the password); a .example is committed.
Verified live: bridge starts on `docker compose up -d`, web UI answers 200 on
:55123, MQTT URL set — it only waits for the Ring login. Fully automatic, no
manual command.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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