The Buffering middleware was causing 413 on large Docker layer pushes
by spooling entire request bodies to disk before forwarding. Docker's
chunked blob upload protocol (PATCH/PUT with Content-Range) requires
streaming, not buffering.
Replace with IngressRoute CRDs + Certificate resources for direct
streaming passthrough. responseForwarding.flushInterval=100ms ensures
prompt chunk delivery to the registry backend.
Will Anderson
d163a92ec6