[AppConfig]: make container user configurable

apps/platform/Dockerfile

@@ -4,8 +4,12 @@ FROM alpine
 RUN apk update
 RUN apk add --upgrade nginx brotli nginx-mod-http-brotli
 
-RUN addgroup -g 1001 -S nginxgroup && \
-    adduser -u 1001 -D -S -G nginxgroup nginxuser
+ARG USER_ID=10001
+ARG GROUP_ID=10001
+ARG USER_NAME=nginxuser
+
+RUN addgroup -g ${GROUP_ID} -S nginxgroup && \
+    adduser -u ${USER_ID} -D -S -G nginxgroup ${USER_NAME}
 
 # copy assets, config and entrypoint
 COPY ./bundle-platform /usr/share/nginx/html
@@ -15,13 +19,13 @@ RUN chmod +x /entrypoint.sh
 
 # create necessary nginx folders and set permissions
 RUN mkdir -p /var/run/nginx /var/log/nginx /etc/nginx /usr/share/nginx/html 
-RUN chown -R nginxuser:nginxgroup /run /var/run/nginx /var/log/nginx /var/lib/nginx /etc/nginx /usr/share/nginx/html
+RUN chown -R ${USER_NAME}:nginxgroup /run /var/run/nginx /var/log/nginx /var/lib/nginx /etc/nginx /usr/share/nginx/html
 
 # adjust nginx config to use correct pid file location and remove user directive
 RUN sed -i 's/\/var\/run\/nginx.pid/\/var\/run\/nginx\/nginx.pid/g' /etc/nginx/nginx.conf
 RUN sed -i '/^user/d' /etc/nginx/nginx.conf
 
-USER nginxuser
+USER ${USER_NAME}
 
 # run nginx
 ENTRYPOINT [ "/entrypoint.sh" ]