Cannot initialize git submodules on VOXL Emulator Docker Image (1.0.0)

git submodule update --recursive Throws following error

git: 'submodule' is not a git command. See 'git --help'.

Missing git-perltools in the voxl-build?

VOXL Emulator Docker Image (1.0.0)

voxl-emulator latest 0e15518b8f95 12 months ago 1.26GB