Report precise commit ids of any cloned repos

This would make stuff like that https://zivgitlab.uni-muenster.de/HPC2SE-Project/pacxx-runtime/merge_requests/23#note_5606, https://gitlab.dune-project.org/joe/pacxx-docker/-/jobs/54142 easier to debug

See also:

Edited Aug 30, 2018 by Jö Fahlke

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information