actions: Add mmdebstrap action #891

Job	Run time
Check DockerHub secrets exist	1s
test (arch)	1m 8s
test (bookworm)	52s
test (trixie)	59s
Build Docker container	23m 52s
Run unit tests	1m 53s
recipes on nofakemachine	36s
templating on nofakemachine	51s
debian (amd64) on nofakemachine	1m 7s
debian with mmdebstrap (amd64) on nofakemachine	54s
recipes on qemu	44s
templating on qemu	59s
partitioning on qemu	57s
msdos partitioning on qemu	54s
debian (amd64) on qemu	6m 54s
debian with mmdebstrap (amd64) on qemu	3m 19s
recipes on uml	44s
templating on uml	43s
partitioning on uml	51s
msdos partitioning on uml	1m 15s
debian (amd64) on uml	5m 20s
debian with mmdebstrap (amd64) on uml	3m 14s
recipes on kvm	57s
templating on kvm	29s
partitioning on kvm	55s
msdos partitioning on kvm	33s
debian (amd64) on kvm	1m 8s
debian with mmdebstrap (amd64) on kvm	1m 9s
debian (arm64) on kvm	2m 29s
debian (armhf) on kvm	2m 14s
arch on kvm	1m 30s
apertis on kvm	1m 48s
allgreen	4s
Publish to GHCR	0s
Publish to DockerHub	0s
	1h 11m 23s

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