How to add user with dockerfile?

Question

How can I add a user with Dockerfile - the following does not work.

USER vault
WORKDIR /usr/local/bin/vault

My full Dockerfile:

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Answer 1

To add group and to associate a new user, use code below.

FROM 
RUN groupadd -g 2000 go \
&& useradd -m -u 2001 -g go go
USER go

OR

RUN addgroup -g 1001 -S appuser && adduser -u 1001 -S appuser  -G appuser