Context: debugging mediasoup/WebRTC failures caused by empty/interpolated vars (EXTERNAL_IPv4, etc.).
- Normalize config/main.yml (ip6_enabled flag, enable greenlight/coturn) and tidy formatting.
- Extend vars/main.yml with BBB_* switches (IPv6, Greenlight, Coturn), TURN/Coturn cert paths.
- env.j2: wire secrets & toggles, guard IPv6 via BBB_IP6_ENABLED, switch LDAP/OIDC to role flags, add TURN/STUN, and general cleanup.
- tasks/main.yml: use BBB_* fact names, robust path joins, write docker-compose.override.yml, and notify compose on env/override changes.
- tasks/01_docker-compose.yml: reference new BBB_DOCKER_COMPOSE_* facts.
- Add templates/docker-compose.override.yml.j2 (placeholder for SFU overrides to avoid bad defaults during runs).
Rationale: make Compose brings deterministic (no empty ), paving the way to set MS_WEBRTC_LISTEN_IPS in override without risk.
Chat reference: debugging thread with GPT-5 Thinking on 2025-09-26 https://chatgpt.com/share/68d59d98-4388-800f-a627-07b6a603d0b2.
