Merge pull request #720 from rwmajor2/build_user_args

Changed Dockerfile for USER/ID/GID to be Docker build arguments

base-notebook/Dockerfile

@@ -7,6 +7,9 @@ ARG BASE_CONTAINER=ubuntu:bionic-20180526@sha256:c8c275751219dadad8fa56b3ac41ca6
 FROM $BASE_CONTAINER
 
 LABEL maintainer="Jupyter Project <jupyter@googlegroups.com>"
+ARG NB_USER="jovyan"
+ARG NB_UID="1000"
+ARG NB_GID="100"
 
 USER root
 
@@ -30,9 +33,9 @@ RUN echo "en_US.UTF-8 UTF-8" > /etc/locale.gen && \
 # Configure environment
 ENV CONDA_DIR=/opt/conda \
     SHELL=/bin/bash \
-    NB_USER=jovyan \
-    NB_UID=1000 \
-    NB_GID=100 \
+    NB_USER=$NB_USER \
+    NB_UID=$NB_UID \
+    NB_GID=$NB_GID \
     LC_ALL=en_US.UTF-8 \
     LANG=en_US.UTF-8 \
     LANGUAGE=en_US.UTF-8