Debugging rebase failure

.github/scripts/rebase-start.sh

@@ -6,6 +6,10 @@ UPSTREAM_URL=$1
 UPSTREAM_BRANCH=$2
 REBASE_BRANCH=$3
 
+git config pull.rebase true
+git config user.name github-actions
+git config user.email [email protected]
+
 # Add and update upstream remote.
 if ! git remote | grep upstream; then
     git remote add upstream $UPSTREAM_URL
@@ -15,15 +19,14 @@ git fetch --all --prune
 
 # Checkout or create $REBASE_BRANCH.
 if git show-ref --verify --quiet refs/remotes/origin/$REBASE_BRANCH; then
+    echo "Resetting $REBASE_BRANCH branch to origin/$REBASE_BRANCH branch."
     git switch $REBASE_BRANCH
-    git pull origin $REBASE_BRANCH
+    git reset --hard origin/$REBASE_BRANCH
 else
+    echo "Creating $REBASE_BRANCH branch from $UPSTREAM_BRANCH branch."
     git switch -c $REBASE_BRANCH
 fi
 
-git config user.name github-actions
-git config user.email [email protected]
-
 # Create upstream branch from upstream/$UPSTREAM_BRANCH.
 git branch upstream upstream/$UPSTREAM_BRANCH
 git push --set-upstream origin upstream