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scratch is reserved and should not be used as a stage name.
PropertyValue
SeverityError
CategoryCorrectness
DefaultEnabled

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Description

Reserved words should not be used as names for stages in multi-stage builds. The reserved words are: context, scratch. Using a reserved word as a stage name can conflict with built-in BuildKit behavior and produce confusing build errors.

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Examples

Bad: 
FROM alpine AS scratch
FROM alpine AS context
Good: 
FROM alpine AS builder

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Reference