Coredumps coming from CI are produced by a commit, which is not
available in the scylla.git repository, as CI runs on a merge commit
between the main branch (master or enterprise) and the tested PR branch.
Currently the script will attempt to checkout this commit and will fail
as the commit hash is unrecognized.
To work around this, add a --ci flag, which when used, will force the
main branch to be checked out, instead of the commit hash.
Closesscylladb/scylladb#18023