Using this image as base
^^^^^^^^^^^^^^^^^^^^^^^^
As per usual concern pacman lsign key should not be distributed. If you want to update packages you need to initialize
public keyring:

    # pacman-key --init
    # pacman-key --populate

After this you can update and install packages as needed:

    # pacman -Sy archlinux-keyring && pacman -Su
    # pacman -S butler-git

If you want to distribute the image afterwards then you should strip the lsign key from the image:

    # rm -rf /etc/pacman.d/gnupg