drm/ci: remove rebase-merge directory

Gitlab runner can cache git repository, including the unfinished rebase
merge status. New CI job will come as a fresh checkout, however this
will not destroy the unfinished rebase, failing our build script.
Destroy the unfinished rebase state.

Suggested-by: David Heidelberg <[email protected]>
Signed-off-by: Dmitry Baryshkov <[email protected]>
Acked-by: Helen Koike <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/570159/
Signed-off-by: Rob Clark <[email protected]>

Author: lumag

drivers/gpu/drm/ci/build.sh

@@ -58,6 +58,9 @@ git config --global user.email "[email protected]"
 git config --global user.name "freedesktop.org CI"
 git config --global pull.rebase true
 
+# cleanup git state on the worker
+rm -rf .git/rebase-merge
+
 # Try to merge fixes from target repo
 if [ "$(git ls-remote --exit-code --heads ${UPSTREAM_REPO} ${TARGET_BRANCH}-external-fixes)" ]; then
     git pull ${UPSTREAM_REPO} ${TARGET_BRANCH}-external-fixes