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Setting platform to predefined $TARGETPLATFORM in FROM is redundant as this is the default behavior.
PropertyValue
SeverityInfo
CategoryBest Practice
DefaultEnabled

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Description

A custom platform can be used for a base image. The default platform is the same platform as the target output, so setting the platform to $TARGETPLATFORM is redundant and unnecessary.

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Examples

Bad: 
FROM --platform=$TARGETPLATFORM alpine AS builder
RUN apk add --no-cache git
Good: 
FROM alpine AS builder
RUN apk add --no-cache git

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Reference