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Add clarification when using USER UID:GI 

Signed-off-by: Michael Irwin <mikesir87@gmail.com>
(cherry picked from commit b3a1681fd8)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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Michael Irwin 2019-09-16 11:35:13 -04:00 committed by Sebastiaan van Stijn
parent 04533bd523
commit 365bae4f89
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docs/reference/builder.md
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@ -1484,6 +1484,9 @@ The `USER` instruction sets the user name (or UID) and optionally the user
group (or GID) to use when running the image and for any `RUN`, `CMD` and
`ENTRYPOINT` instructions that follow it in the `Dockerfile`.
> Note that when specifying a group for the user, the user will have _only_ the
> specified group membership. Any other configured group memberships will be ignored.
> **Warning**:
> When the user doesn't have a primary group then the image (or the next
> instructions) will be run with the `root` group.