build APKs using rootless container buildserver rather than VM
Since the APKs generated by the verification server are not releases, they do not need to have the strict build requirements of the production release buildserver. Using docker instead of libvirt or VirtualBox will allow the verification setup to run in cheaper and more available VMs since the current setup requires nested KVM support or bare metal.
The existing Vagrant buildserver provisioning should work with Vagrant's Docker provider.
@e3amn2l @proletarius101 I can provide a dedicated VM with 400GB disk, 8GB RAM for anyone who wants to take on this project.