Merge remote-tracking branch 'origin/update-submodules-ci-support' into feature/stokes-3d-tests

.gitlab-ci.yml

@@ -6,12 +6,13 @@ variables:
 
 before_script:
 - echo "Running make concurrently with $(nproc) cores, where possibly"
+# make sure we can update submodules and apply the patches
+- git submodule foreach --recursive git reset --hard HEAD
+- git submodule foreach --recursive git clean -fdx
 # work around https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/issues/2148
 - git submodule sync --recursive
 - git submodule update --init --recursive
 # end workaround
-# make sure we can apply the patches
-- git submodule foreach --recursive git reset --hard HEAD
 - patches/apply_patches.sh
 # detect number of processors, but make sure never to run with -j"", as the
 # build host would likely run out of memory