Check if artifactdir exists early #464

Job	Run time
test (debos-arch)	1m 29s
test (debos-bookworm)	1m 6s
test (debos-bullseye)	58s
test (debos-trixie)	1m 38s
Check DockerHub secrets exist	1s
Build Docker container	7m 38s
Run unit tests	2m 55s
recipes on nofakemachine	1m 8s
debian (amd64) on nofakemachine	1m 40s
debian (arm64) on nofakemachine	2m 58s
debian (armhf) on nofakemachine	2m 56s
recipes on qemu	1m 10s
debian (amd64) on qemu	8m 33s
debian (arm64) on qemu	46m 10s
debian (armhf) on qemu	42m 58s
recipes on uml	52s
debian (amd64) on uml	4m 54s
debian (arm64) on uml	9m 25s
debian (armhf) on uml	20m 18s
arch on arch	12m 51s
partitioning on qemu	1m 40s
apertis on uml	6m 36s
partitioning on uml	1m 6s
allgreen	2s
Publish to GHCR	3m 43s
Publish to DockerHub	3m 3s
	3h 7m 48s

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