actions: Add mmdebstrap action #834

Job	Run time
Check DockerHub secrets exist	1s
test (arch)	1m 3s
test (bookworm)	50s
test (trixie)	54s
Build Docker container	2m 58s
Run unit tests	1m 45s
recipes on nofakemachine	35s
templating on nofakemachine	53s
debian (amd64) on nofakemachine	1m 9s
recipes on qemu	1m 9s
templating on qemu	59s
partitioning on qemu	52s
msdos partitioning on qemu	51s
debian (amd64) on qemu	6m 48s
recipes on uml	36s
templating on uml	37s
partitioning on uml	55s
msdos partitioning on uml	55s
debian (amd64) on uml	5m 16s
recipes on kvm	31s
templating on kvm	48s
partitioning on kvm	53s
msdos partitioning on kvm	39s
debian (amd64) on kvm	1m 5s
debian (arm64) on kvm	2m 27s
debian (armhf) on kvm	2m 3s
arch on kvm	1m 25s
apertis on kvm	2m 49s
allgreen	2s
Publish to GHCR	0s
Publish to DockerHub	0s
	41m 48s

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