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Add clarification when using USER UID:GI 

Signed-off-by: Michael Irwin <mikesir87@gmail.com>
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Michael Irwin 2019-09-16 11:35:13 -04:00
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@ -1478,6 +1478,9 @@ 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 group (or GID) to use when running the image and for any `RUN`, `CMD` and
`ENTRYPOINT` instructions that follow it in the `Dockerfile`. `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**: > **Warning**:
> When the user doesn't have a primary group then the image (or the next > When the user doesn't have a primary group then the image (or the next
> instructions) will be run with the `root` group. > instructions) will be run with the `root` group.