Build the Dangerzone VM for running podman

Thanks, alpine-make-vm-image project. License: MIT

To build the qcow2 VM image:

docker run \
    --privileged --cap-add=ALL \
    -v $(pwd):/build ubuntu:latest /build/build-qcow2.sh

This will create a VM image file called vm/dangerzone.qcow2.

To build an ISO image:

docker run -v $(pwd):/build alpine:latest /build/build-iso.sh