move from sudo to exec setpriv (#2600)

docker-unified/Dockerfile

@@ -214,7 +214,6 @@ RUN apt-get update && apt-get install -y \
     supervisor \
     tzdata \
     unzip \
-    sudo \
     && rm -rf /var/lib/apt/lists/*
 
 # Create required directories

docker-unified/entrypoint.sh

@@ -99,4 +99,4 @@ chown -R $PUID:$PGID \
     /var/run/nginx \
     /run
 
-sudo -E -u \#$PUID /usr/bin/supervisord
+exec setpriv --reuid=$PUID --regid=$PGID --init-groups /usr/bin/supervisord