Adding Debian packages
If you have packages, : add your list of packages to
install git, and vim set the line to
readonly G_USER_PACKAGES="git vim"
If you have your application to be installed on your rootfs:
Take https://github.com/varigit/debian-var/blob/debian_buster_var01/variscite/weston_rootfs.sh#L295 lines as an example and install your applications,
config files / settings etc. Don't forget to copy your resources to variscite folder.