Fixing auto-checkout issues

.gitea/workflows/Merge-Checker.yaml

@@ -54,13 +54,12 @@ jobs:
         run: |
           git config --global user.name "ci-bot"
           git config --global user.email "ci-bot@local"
+          git stash
 
           BRANCH_NAME="${{ github.event.pull_request.head.ref }}"
-          git stash
-          git checkout "$BRANCH_NAME" "origin/$BRANCH_NAME"
-          git pull
 
           echo "Checking if last commit was a timing update"
+          git pull
           LAST_COMMIT_MSG=$(git log -1 --pretty=%B)
 
           if echo "$LAST_COMMIT_MSG" | grep -q "Update matrix-timing-tests timings"; then
@@ -72,6 +71,7 @@ jobs:
 
           echo "Checking out source branch $BRANCH_NAME"
           git fetch origin "$BRANCH_NAME"
+          git checkout -B "$BRANCH_NAME" "origin/$BRANCH_NAME"
           git stash pop
 
           git add unit-tests/timing-results/matrix-timing-tests.txt