You will need a working OS template to work with this project.

Easy solution create an OS template:

• mount the archlinux installation .iso in a VM
• run pacstrap /mnt base linux openssh
• run ln -s /usr/lib/systemd/system/sshd.service /mnt/etc/systemd/system/multi-user.target.wants/sshd.service
• run fsarchiver savedir /tmp/os_template.fsa /mnt
• download /tmp/os_template.fsa
• upload the os_template.fsa anywhere so that it can be downloaded with wget

Some notes on the above:

• base and linux are the only packages to run a VM
• you will need sshd to operate the VM, so create the symlink to make it start with the OS
• fsarchiver is very good at preserving OS data
• the initrd will dump that template to the encrypted disk
• the same procedure can be used with any distribution, but we didn't test that yet