Switch CI to opam 2 (fix #217).
This currently does not work, as installation of Coq 8.8 (in job full-4.07.0) fails for reasons that are not clear to me.
Prochaines maintenances programmées: lundi 06/05, lundi 03/06, lundi 01/07
Pour plus d'informations: https://doc-si.inria.fr/display/SU/Gitlab
This currently does not work, as installation of Coq 8.8 (in job full-4.07.0) fails for reasons that are not clear to me.