Ubuntu base: fail to build because of a reference to `provisionning/ubuntu/http`

During my test, the base Ubuntu base jobs failed with the following error:

==> base.qemu.ubuntu: Error finding "/home/gitlab-runner/builds/UpbGXxc7/0/daniel.dehennin/builder/provisionning/ubuntu/http": stat /home/gitlab-runner/builds/UpbGXxc7/0/daniel.dehennin/builder/provisionning/ubuntu/http: no such file or directory