image_build: add note about initramfs SSH key reusal security

Author: dezeroku

image_build/preseed.cfg

@@ -64,6 +64,8 @@ d-i grub-installer/bootdev string default
 d-i finish-install/reboot_in_progress note
 
 # Prepare for the Ansible bootstrap
+# TODO is using same SSH key in encrypted system and initramfs a security risk?
+# or rather, how much of a security risk is it?
 d-i preseed/late_command string \
     echo "ansible_bootstrap   ALL=(ALL:ALL) NOPASSWD:ALL" > /target/etc/sudoers.d/01-ansible_bootstrap ; \
     mkdir /target/home/ansible_bootstrap/.ssh ; \