actions: Document 'artifacts' value for the origin property #759

Job	Run time
Check DockerHub secrets exist	1s
test (arch)	1m 16s
test (bookworm)	53s
test (trixie)	1m 4s
Build Docker container	3m 16s
Run unit tests	1m 50s
recipes on nofakemachine	48s
templating on nofakemachine	46s
debian (amd64) on nofakemachine	2m 32s
recipes on qemu	43s
templating on qemu	44s
partitioning on qemu	1m 22s
msdos partitioning on qemu	1m 6s
debian (amd64) on qemu	6m 48s
recipes on uml	43s
templating on uml	42s
partitioning on uml	57s
msdos partitioning on uml	2m 8s
debian (amd64) on uml	4m 55s
recipes on kvm	1m 24s
templating on kvm	44s
partitioning on kvm	36s
msdos partitioning on kvm	36s
debian (amd64) on kvm	1m 10s
debian (arm64) on kvm	2m 22s
debian (armhf) on kvm	2m 16s
arch on kvm	1m 28s
apertis on kvm	1m 48s
allgreen	2s
Publish to GHCR	0s
Publish to DockerHub	0s
	45m 0s

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