commands: Add --pipe to nspawn invocation #728

Job	Run time
Check DockerHub secrets exist	1s
test (arch)	1m 7s
test (bookworm)	53s
test (trixie)	56s
Build Docker container	3m 19s
Run unit tests	2m 17s
recipes on nofakemachine	32s
templating on nofakemachine	35s
debian (amd64) on nofakemachine	1m 16s
recipes on qemu	55s
templating on qemu	45s
partitioning on qemu	1m 7s
msdos partitioning on qemu	51s
debian (amd64) on qemu	5m 15s
recipes on uml	58s
templating on uml	53s
partitioning on uml	56s
msdos partitioning on uml	55s
debian (amd64) on uml	4m 54s
recipes on kvm	36s
templating on kvm	30s
partitioning on kvm	47s
msdos partitioning on kvm	39s
debian (amd64) on kvm	1m 42s
debian (arm64) on kvm	2m 14s
debian (armhf) on kvm	2m 16s
arch on kvm	1m 50s
apertis on kvm	2m 46s
allgreen	7s
Publish to DockerHub	2m 25s
Publish to GHCR	2m 23s
	46m 40s

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