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Add documentation note that LABEL allows environment replacement

Signed-off-by: Tim Waugh <twaugh@redhat.com>

Tim Waugh authored on 2015/09/16 22:38:58
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@@ -155,6 +155,7 @@ the `Dockerfile`:
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 * `COPY`
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 * `ENV`
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 * `EXPOSE`
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+* `LABEL`
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 * `USER`
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 * `WORKDIR`
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 * `VOLUME`