Revert "docker: Install archlinux-keyring from source" #735

Job	Run time
Check DockerHub secrets exist	1s
test (arch)	1m 6s
test (bookworm)	54s
test (trixie)	1m 10s
Build Docker container	3m 22s
Run unit tests	2m 0s
recipes on nofakemachine	32s
templating on nofakemachine	30s
debian (amd64) on nofakemachine	57s
recipes on qemu	44s
templating on qemu	45s
partitioning on qemu	1m 16s
msdos partitioning on qemu	54s
debian (amd64) on qemu	6m 37s
recipes on uml	40s
templating on uml	41s
partitioning on uml	55s
msdos partitioning on uml	57s
debian (amd64) on uml	5m 0s
recipes on kvm	36s
templating on kvm	30s
partitioning on kvm	45s
msdos partitioning on kvm	50s
debian (amd64) on kvm	1m 13s
debian (arm64) on kvm	2m 14s
debian (armhf) on kvm	2m 32s
arch on kvm	1m 15s
apertis on kvm	1m 45s
allgreen	2s
Publish to GHCR	0s
Publish to DockerHub	0s
	40m 43s

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