ci,docker: use ch3:sock backend in Opensuse MPICH
This is the only mpich backend that is known to work properly and consistently in CI.
Edited by Vicente Bolea
System updates will be applied on Nov 25th between 7am and 9am, EST (UTC-05:00). This site will have intermittent downtime during that time.
This is the only mpich backend that is known to work properly and consistently in CI.