Can a variable be used in docker FROM?

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This is now possible if anyone comes here looking for answers: https://docs.docker.com/engine/reference/builder/#understand-how-arg-and-from-interact

FROM instructions support variables that are declared by any ARG instructions that occur before the first FROM.

ARG  CODE_VERSION=latest
FROM base:${CODE_VERSION}
CMD  /code/run-app

FROM extras:${CODE_VERSION}
CMD  /code/run-extras

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