Add customization mecanism for keyboard layout, hostname, username:password and root password with the config file

stage2/01-sys-tweaks/01-run.sh

@@ -37,7 +37,7 @@ for GRP in input spi i2c gpio; do
 	groupadd -f -r "$GRP"
 done
 for GRP in adm dialout cdrom audio users sudo video games plugdev input gpio spi i2c netdev; do
-  adduser pi $GRP
+  adduser ${RPI_USERNAME} $GRP
 done
 EOF
 
@@ -45,8 +45,4 @@ on_chroot << EOF
 setupcon --force --save-only -v
 EOF
 
-on_chroot << EOF
-usermod --pass='*' root
-EOF
-
 rm -f "${ROOTFS_DIR}/etc/ssh/"ssh_host_*_key*