activate wheel group in installer script

installer/install-arch

@@ -157,6 +157,9 @@ arch-chroot /mnt useradd --create-home --user-group --shell /usr/bin/zsh --group
 
 arch-chroot /mnt chsh -s /usr/bin/zsh
 
+echo "Activating wheel group"
+sed -i 's/^\#\s%wheel\sALL=(ALL:ALL)\sNOPASSWD:\sALL$/%wheel ALL=(ALL:ALL) NOPASSWD: ALL/' /mnt/etc/sudoers
+
 echo "${user}:${user_password}" | chpasswd --root /mnt
 echo "root:${user_password}" | chpasswd --root /mnt
 
@@ -176,4 +179,5 @@ Manual configuration is still needed for the following
 - configure grub parameters for cryptvolume and resume hook
 - generate main grub.cfg with grub-mkconfig -o /boot/grub/grub.cfg
 ---------------------
-EOF
+
+