Generate an ostree static delta for rollback test

The test ostree commit is generated after the successful commit.
Removing updatectl, it makes it impossible to mark an update successful.
Hence the bootcount will be increased at each boot, eventually causing
rollback to the previous deployment.

Signed-off-by: Frédéric Dalleau <frederic.dalleau@collabora.com>

Make a separate recipe from the test commit

Signed-off-by: Frédéric Dalleau <frederic.dalleau@collabora.com>