Document that both MOK files must exist #414

Job	Run time
Test in Ubuntu VM (22.04)	1m 19s
Test in Ubuntu VM (20.04)	48s
Build in containers (almalinux, 9)	2m 46s
Build in containers (almalinux, 8)	2m 47s
Build in containers (alpine, 3.17, -lts)	1m 32s
Build in containers (alpine, 3.17, -virt)	58s
Build in containers (alpine, 3.16, -lts)	1m 52s
Build in containers (alpine, 3.16, -virt)	57s
Build in containers (alpine, 3.15, -lts)	1m 33s
Build in containers (alpine, 3.15, -virt)	57s
Build in containers (archlinux, latest)	1m 21s
Build in containers (archlinux, latest, -lts)	1m 25s
Build in containers (archlinux, latest, -zen)	1m 20s
Build in containers (centos/centos, stream9, quay.io/)	2m 45s
Build in containers (centos/centos, stream8, quay.io/)	2m 43s
Build in containers (centos, 7)	2m 44s
Build in containers (debian, 12)	1m 20s
Build in containers (debian, 11)	1m 23s
Build in containers (debian, 10)	1m 29s
Build in containers (gentoo/stage3, latest)	2m 38s
Build in containers (ubuntu, 22.04)	2m 4s
Build in containers (ubuntu, 20.04)	2m 22s
Build in containers (ubuntu, 18.04)	2m 4s
	41m 7s

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