Drop chroot sandboxing backend
This drops the chroot sandboxing backend in favor of buildbox-run.
Proposal with background: https://mail.gnome.org/archives/buildstream-list/2019-December/msg00021.html
This drops the chroot sandboxing backend in favor of buildbox-run.
Proposal with background: https://mail.gnome.org/archives/buildstream-list/2019-December/msg00021.html