Use github cache for docker layers (#1164)
Use github cache for docker layers (#1164)

Cache the build layers between github action builds to reduce time
required.
vagrant-libvirt/vagrant-libvirt,electrofelix/vagrant-libvirt,electrofelix/vagrant-libvirt,electrofelix/vagrant-libvirt,pradels/vagrant-libvirt,vagrant-libvirt/vagrant-libvirt,pradels/vagrant-libvirt,vagrant-libvirt/vagrant-libvirt