- Multi-stage Dockerfile with BuildKit npm cache mounts and a separate
prod-deps stage so source edits don't reinstall or prune.
- Tighter .dockerignore to shrink build context.
- Healthchecks: add start_period and tighten interval/retries so
containers report healthy as soon as the process is actually ready
instead of after a full polling interval.
- Move recoverStuckPreparing() off the startup critical path; the
recovery sweep now runs in the background after app.listen.
- depends_on uses condition: service_healthy and the obsolete
compose 'version' key is gone.
- New scripts/build.sh + scripts/deploy.sh: deploy.sh builds, exits
early if the image is unchanged, runs a blue/green streamer swap
(scale to 2N, wait healthy in parallel, drop olds), then recreates
the API with --no-deps to avoid compose's depends_on re-poll.
tdurieux