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COPY with more than 2 arguments requires the last argument to end with /.
PropertyValue
SeverityError
CategoryCorrectness
DefaultEnabled

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Description

If multiple source resources are specified in a COPY instruction, then the destination must be a directory and it must end with a slash /. Omitting the trailing slash causes ambiguity and may lead to build errors or unexpected behavior.

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Examples

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Problematic code

FROM node:carbon
COPY package.json yarn.lock my_app

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Correct code

FROM node:carbon
COPY package.json yarn.lock my_app/

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Reference