Refactor error handling #679

Job	Run time
test (arch)	1m 7s
test (bookworm)	57s
Check DockerHub secrets exist	1s
test (trixie)	1m 1s
Build Docker container	3m 38s
recipes on nofakemachine	36s
templating on nofakemachine	49s
debian (amd64) on nofakemachine	1m 15s
debian (arm64) on nofakemachine	2m 28s
debian (armhf) on nofakemachine	2m 9s
Run unit tests	2m 6s
recipes on qemu	59s
templating on qemu	54s
debian (amd64) on qemu	5m 26s
debian (arm64) on qemu	33m 12s
debian (armhf) on qemu	36m 40s
recipes on uml	1m 2s
templating on uml	40s
debian (amd64) on uml	4m 53s
debian (arm64) on uml	10m 14s
debian (armhf) on uml	17m 35s
recipes on kvm	1m 8s
templating on kvm	1m 13s
debian (amd64) on kvm	2m 0s
debian (arm64) on kvm	3m 34s
debian (armhf) on kvm	3m 23s
arch on kvm	2m 17s
apertis on kvm	1m 57s
allgreen	2s
Publish to GHCR	0s
Publish to DockerHub	0s
	2h 23m 16s

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