`cargo test --workspace` fails on any fresh machine: hub.docker.com's minio/minio returned 404 for the whole repository on 2026-09-19, and testcontainers cannot pull it. CI on gw-04 kept passing because a year-old copy is cached there and testcontainers pulls only when the local create returns 404 — one image prune away from failing forever, and already failing here. MinIO publishes the same image on quay.io; the manifest answers 200. Found while reproducing a red CI run that turned out to be environmental. Co-Authored-By: Claude Opus 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01WZb5A2kfVfjpdwSochkuHz