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.
PVC manifests: add volumeName to bind new PVCs to existing PVs whose
old PVCs were accidentally deleted during Terraform->ArgoCD migration.
All PVs patched to Retain to prevent data loss on pod restart.
kube-prometheus-stack: replace invalid adminPassword.valueFrom.secretKeyRef
(Helm values don't support k8s secretKeyRef syntax) with correct
admin.existingSecret + admin.passwordKey pattern.