- Use Docker embedded DNS (127.0.0.11) with variables in proxy_pass
instead of upstream blocks to prevent nginx crash loops when
backend isn't ready during startup
- Add STACK_NAME env to web and livekit services for golang
template_driver config resolution
- Add LIVEKIT_API_KEY env to livekit service for config template
- Add livekit_as secret to livekit service
- Increase web healthcheck retries and start_period
- Bump NGINX_CONF_VERSION to v2