docs: say ARG/ENV names for Dockerfile substitution - #25845
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Hyphens are not part of the name, so $foo-bar is $foo plus -bar. RUN still lets the shell do whatever the OS accepts. Signed-off-by: Dean Chen <862469039@qq.com>
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$foo-baris$fooplus-bar. hyphen isn't in the name. RUN still lets the shell do its own thing.see docker/buildx#1291 and docker/buildx#3145