Update Dockerfile2

Dockerfile2

@@ -35,8 +35,8 @@ RUN wget https://download3.rstudio.org/ubuntu-18.04/x86_64/shiny-server-1.5.20.1
 # copy my shiny app.
 COPY ./example_proj /srv/shiny-server
 
-RUN addgroup --gid 1000 kiwi \
- && adduser --disabled-password --gecos '' --uid 1000 --gid 1000 kiwi
+RUN addgroup --gid 999 shiny \
+ && adduser --disabled-password --gecos '' --uid 999 --gid 999 shiny
 
 RUN chown shiny:shiny /var/lib/shiny-server
 RUN mkdir -p /var/log/shiny-server