Audit one Dockerfile for what its layers will cost and what its build records. Line continuations are joined first, which is what makes the layer questions answerable at all. Reports a package index updated in a layer of its own, so a later install uses a cached index months stale; a dependency install after a copy of the whole context, so that layer rebuilds on every source change; a download piped into a shell; and a credential-shaped build variable, recorded in the image history.

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