Small improvements to filesystem-deploy action #888

Job	Run time
Check DockerHub secrets exist	1s
test (arch)	1m 2s
test (bookworm)	53s
test (trixie)	58s
Build Docker container	23m 57s
Run unit tests	1m 53s
recipes on nofakemachine	35s
templating on nofakemachine	36s
debian (amd64) on nofakemachine	1m 22s
recipes on qemu	1m 4s
templating on qemu	41s
partitioning on qemu	54s
msdos partitioning on qemu	52s
debian (amd64) on qemu	6m 59s
recipes on uml	42s
templating on uml	50s
partitioning on uml	1m 0s
msdos partitioning on uml	55s
debian (amd64) on uml	4m 58s
recipes on kvm	50s
templating on kvm	32s
partitioning on kvm	37s
msdos partitioning on kvm	37s
debian (amd64) on kvm	1m 8s
debian (arm64) on kvm	2m 22s
debian (armhf) on kvm	2m 18s
arch on kvm	1m 51s
apertis on kvm	1m 49s
allgreen	4s
Publish to GHCR	0s
Publish to DockerHub	0s
	1h 2m 20s

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