Delete ubuntu user

Dockerfile

@@ -9,6 +9,8 @@ RUN mkdir -p /var/cache/nginx \
              /var/lib/nginx
 RUN touch /var/run/nginx.pid
 
+# Ubuntu 24.04 includes ubuntu with uid 1000
+RUN userdel -r ubuntu
 RUN chown -R 1000:1000 /var/cache/nginx \
                        /var/log/nginx \
                        /var/lib/nginx \