Add qemu-x86_64 image build artifacts to storage.puri.sm

Ideally the latest qemu-x86_64.img.xz should be published to some place on storage.puri.sm. I would think that it should go here: https://storage.puri.sm/librem5/binaries/unstable/latest/

Edited Jun 15, 2018 by Heather Ellsworth

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