Debian live with encrypted persistence support

thanks to cgraff , haylo on #debian-live OFTC

use auto scripts to config
lb config
lb build

to copy the image on an usb stick do the following

# MAKE THE PARTITION, 
sudo parted "${devicel}" mkpart primary "${bytes}" "${usb_size}"  

# ENCRYPT THE PARTITION
sudo cryptsetup --verbose --verify-passphrase luksFormat "${devicel}2"

# OPEN THE ENCRYPTED PARTITION
sudo cryptsetup luksOpen "${devicel}2" my_usb 

# MAKE A FILESYSTEM ON IT AND LABEL IT "persistence"
sudo mkfs.ext3 -L persistence /dev/mapper/my_usb

# MAKE A MOUNT POINT
sudo mkdir -p /mnt/my_usb

# MOUNT THE OPENED ENCYRYPTION PARTITION
sudo mount /dev/mapper/my_usb /mnt/my_usb/

# MAKE THE PERSISTENCE.CONF FILE
echo "/ union" > ~/persistence.conf && sudo mv ~/persistence.conf \
                      /persistence.conf && sudo mv /persistence.conf /mnt/my_usb

# UMOUNT IT
sudo umount /dev/mapper/my_usb

# CLOSE THE LUKS PARTITION
sudo cryptsetup luksClose /dev/mapper/my_usb