fix: update user and group modification logic in entrypoint script (again)

entrypoint.sh

@@ -8,14 +8,14 @@ PGID=${PGID:-1001}
 if [ "$PGID" != "1001" ]; then
   existing_group=$(getent group "$PGID" | cut -d: -f1)
   if [ -n "$existing_group" ] && [ "$existing_group" != "nodejs" ]; then
-    groupdel "$existing_group"
+    groupmod -g "$((PGID + 50000))" "$existing_group"
   fi
   groupmod -g "$PGID" nodejs
 fi
 if [ "$PUID" != "1001" ]; then
   existing_user=$(getent passwd "$PUID" | cut -d: -f1)
   if [ -n "$existing_user" ] && [ "$existing_user" != "nextjs" ]; then
-    userdel "$existing_user"
+    usermod -u "$((PUID + 50000))" "$existing_user"
   fi
   usermod -u "$PUID" nextjs
 fi