ci: refactor to use official Hugging Face sync action

Author: suprit-4618

.github/workflows/huggingface-sync.yml

@@ -15,7 +15,10 @@ jobs:
           fetch-depth: 0
           lfs: true
 
-      - name: Push to Hugging Face
-        env:
-          HF_TOKEN: ${{ secrets.HF_TOKEN }}
-        run: git push https://suprit4618:$HF_TOKEN@huggingface.co/spaces/suprit4618/semantic-rag-engine HEAD:main -f
+      - name: Sync to Hugging Face Space
+        uses: huggingface/hub-sync@v0.1.0
+        with:
+          github_repo_id: ${{ github.repository }}
+          huggingface_repo_id: suprit4618/semantic-rag-engine
+          hf_token: ${{ secrets.HF_TOKEN }}
+          repo_type: space