ci: improve HF Space sync workflow with git-based approach

.github/workflows/sync-to-hf-space.yml

@@ -13,8 +13,16 @@ jobs:
           fetch-depth: 0
 
       - name: Push to Hugging Face Space
-        uses: cdanwards/action-push-to-hf-space@v2
-        with:
-          hf_token: ${{ secrets.HF_TOKEN }}
-          hf_space_name: ${{ secrets.HF_USERNAME }}/${{ secrets.HF_SPACE_NAME }}
-          branch: main
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+          HF_USERNAME: ${{ secrets.HF_USERNAME }}
+          HF_SPACE_NAME: ${{ secrets.HF_SPACE_NAME }}
+        run: |
+          git clone https://oauth2:${HF_TOKEN}@huggingface.co/spaces/${HF_USERNAME}/${HF_SPACE_NAME} /tmp/hf-space
+          cp -r . /tmp/hf-space/ --exclude='.git' --exclude='.github' --exclude='__pycache__' --exclude='.pytest_cache' --exclude='.ruff_cache'
+          cd /tmp/hf-space
+          git config user.email "action@github.com"
+          git config user.name "GitHub Action"
+          git add -A
+          git diff --staged --quiet || git commit -m "Sync from GitHub"
+          git push