[RFC] Switch from the vfs to overlayfs storage driver
Building big containers using ci-templates is excruciatingly slow on SSD drives. I assume this is due to the storage driver being set to "vfs" rather than overlayfs (using fuse-overlayfs).
This seems to be due to https://gitlab.freedesktop.org/freedesktop/ci-templates/-/blob/master/bootstrap/bootstrap_fedora.sh#L79, but it is also found in the qemu image: https://gitlab.freedesktop.org/freedesktop/ci-templates/-/blob/master/bootstrap/cbuild#L648