Refactor error handling #419

Job	Run time
test (debos-arch)	1m 45s
test (debos-bookworm)	1m 21s
test (debos-bullseye)	1m 12s
test (debos-trixie)	1m 17s
Check DockerHub secrets exist	1s
Build Docker container	7m 11s
Run unit tests	3m 4s
recipes on nofakemachine	1m 4s
debian (amd64) on nofakemachine	1m 37s
debian (arm64) on nofakemachine	3m 3s
debian (armhf) on nofakemachine	2m 48s
recipes on qemu	1m 9s
debian (amd64) on qemu	8m 0s
debian (arm64) on qemu	50m 17s
debian (armhf) on qemu	32m 14s
recipes on uml	52s
debian (amd64) on uml	7m 13s
debian (arm64) on uml	9m 57s
debian (armhf) on uml	17m 45s
arch on arch	14m 12s
partitioning on qemu	1m 10s
apertis on uml	9m 29s
partitioning on uml	1m 0s
allgreen	3s
Publish to GHCR	0s
Publish to DockerHub	0s
	2h 57m 44s

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