scripts: add_user_to_groups: Add user to docker group

Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@collabora.com>

scripts/add_user_to_groups.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-DEFGROUPS="admin,adm,dialout,cdrom,plugdev,audio,dip,video,staff,shared,sudo"
+DEFGROUPS="admin,adm,dialout,cdrom,plugdev,audio,dip,video,staff,shared,sudo,docker"
 
 for group in $(echo $DEFGROUPS | tr ',' ' '); do
     if /bin/egrep  -i "^$group" /etc/group ; then