Clarification about 'docker build --build-arg'
See #22860 Signed-off-by: Nahum Shalman <nshalman@omniti.com>master
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@ -299,6 +299,9 @@ accessed like regular environment variables in the `RUN` instruction of the
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Dockerfile. Also, these values don't persist in the intermediate or final images
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like `ENV` values do.
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Using this flag will not alter the output you see when the `ARG` lines from the
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Dockerfile are echoed during the build process.
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For detailed information on using `ARG` and `ENV` instructions, see the
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[Dockerfile reference](../builder.md).
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