Revert "[CI] Enable pointing to a SHA from another remote (than the one by default)."
This reverts commit ef5b4b8f.
In the current gitlab-ci setup, the same source directory can be reused.
This can lead the command git remote add <name> to fail, and so the ci
pipeline, in case the remote already exist.
@melanie.carriere PTAL
Edited by Nick Laurenson