feat(vm): derive guest rootfs from sandbox images (#957) #2

Job	Run time
Compute Versions	1d 0h 0m 0s
Download Kernel Runtime	1d 0h 0m 0s
Build Rootfs (${{ matrix.arch }})	0s
Build Driver VM (macOS)	-1s
Build VM (macOS)	-1s
Build Driver VM (Linux ${{ matrix.arch }})	-1s
Build VM (Linux ${{ matrix.arch }})	-1s
Release VM Dev	0s
	1d 23h 59m 56s

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