chore(build): fix typo

contrib/afterinstall.sh

@@ -2,6 +2,6 @@
 export USER="nobody"
 export GROUP="nogroup"
 id -u $USER &>/dev/null || useradd $USER
-id -g $GROUP &>/dev/null || groudadd $GROUP
+id -g $GROUP &>/dev/null || groupadd $GROUP
 
 systemctl daemon-reload