ci: use generic test container #627

Job	Run time
Check DockerHub secrets exist	1s
test (arch)	1m 9s
test (bookworm)	51s
test (bullseye)	45s
test (trixie)	1m 2s
Build Docker container	3m 15s
Run unit tests	2m 4s
recipes on nofakemachine	32s
escaping on nofakemachine	30s
debian (amd64) on nofakemachine	1m 14s
debian (arm64) on nofakemachine	2m 11s
debian (armhf) on nofakemachine	2m 1s
recipes on qemu	41s
escaping on qemu	40s
debian (amd64) on qemu	4m 54s
debian (arm64) on qemu	33m 41s
debian (armhf) on qemu	36m 33s
recipes on uml	42s
escaping on uml	42s
debian (amd64) on uml	5m 7s
debian (arm64) on uml	10m 26s
debian (armhf) on uml	17m 47s
recipes on kvm	1m 7s
escaping on kvm	1m 15s
debian (amd64) on kvm	2m 6s
debian (arm64) on kvm	3m 54s
debian (armhf) on kvm	3m 55s
arch on kvm	2m 43s
apertis on kvm	1m 50s
allgreen	3s
Publish to DockerHub	2m 52s
Publish to GHCR	2m 21s
	2h 28m 54s

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