Remove addgroup directive from alpine building

images/nginx/rootfs/Dockerfile

@@ -53,7 +53,6 @@ RUN apk update \
     nano \
     tzdata \
   && ln -s /usr/local/nginx/sbin/nginx /sbin/nginx \
-  && addgroup -Sg 101 www-data \
   && adduser -S -D -H -u 101 -h /usr/local/nginx \
     -s /sbin/nologin -G www-data -g www-data www-data \
   && bash -eu -c ' \

images/nginx/rootfs/build.sh

@@ -733,7 +733,6 @@ writeDirs=( \
   /var/log/nginx \
 );
 
-addgroup -Sg 101 www-data
 adduser -S -D -H -u 101 -h /usr/local/nginx -s /sbin/nologin -G www-data -g www-data www-data
 
 for dir in "${writeDirs[@]}"; do