message: Document expected failure
diff: @@ -108,4 +108,10 @@ jobs:
  git remote add reference https://github.com/mfem/mfem.git
  git fetch reference master:master
  git checkout -b gh-actions-branch-history
  + # Note: the script below will run `git fetch origin master:master.
  + # This may fail on forks because the forked master may be far behind.
  + # This is OK because we are sure to be up-to-date with the fetch from
  + # "reference" we do here.
  + # An alternative would be to change origin here, so that it points to
  + # the main repo (like reference).
  ./config/githooks/pre-push --history
  