Fixing auto-checkout issues

.gitea/workflows/Merge-Checker.yaml

@@ -50,18 +50,22 @@ jobs:
             exit 1
           fi
       - name: Commit and push timing results
-        if: github.event.pull_request.head.repo.full_name == github.repository  # Only push from same repo
+        if: github.event.pull_request.head.repo.full_name == github.repository
         run: |
           git config --global user.name "ci-bot"
           git config --global user.email "ci-bot@local"
 
           BRANCH_NAME="${{ github.event.pull_request.head.ref }}"
 
+          echo "Checking out source branch $BRANCH_NAME"
+          git fetch origin "$BRANCH_NAME"
+          git checkout -B "$BRANCH_NAME" "origin/$BRANCH_NAME"
+
           git add unit-tests/timing-results/matrix-timing-tests.txt
 
           if git diff --quiet --cached; then
             echo "No changes to commit"
           else
             git commit -m "Update matrix-timing-tests timings [skip ci]"
-            git push origin HEAD:$BRANCH_NAME
+            git push origin "$BRANCH_NAME"
           fi