What this snippet does
diff lists files added, changed or deleted relative to the image, which exposes stray writes.
Expected output
C /app A /app/tmp/cache.db
Why practise typing this
Typing debugging & ops code builds muscle memory for the symbols and indentation Docker uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
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