I see only those two images (current ones) that suit there (made for devkit):
https://arm01.puri.sm/job/Images/job/Image%20Build/11563/
https://arm01.puri.sm/job/Images/job/Image%20Build/11572/
Also, here is link to some quite related guide, so you can double check things you are about to execute: External battery charger for Librem5 - #48 by Quarnero.
https://arm01.puri.sm/job/u-boot_builds/job/uboot_devkit_build/