Add Git LFS support to HF mirror workflow

Enabled Git LFS in the checkout step and added steps to ensure LFS objects are present before pushing to the Hugging Face mirror. This ensures large files tracked by LFS are properly handled during mirroring.

.github/workflows/hf-mirror.yml

@@ -13,17 +13,25 @@ jobs:
   mirror:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout (full history)
+      - name: Checkout (full history + LFS)
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          lfs: false
+          lfs: true
 
       - name: Configure git identity
         run: |
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"
 
+      - name: Ensure LFS objects are present
+        run: |
+          git lfs install
+          # Fetch any missing LFS content referenced by HEAD
+          git lfs fetch --all || true
+          git lfs checkout || true
+          echo "LFS files present:" && git lfs ls-files || true
+
       - name: Push to HF mirror
         env:
           HF_USERNAME: ${{ secrets.HF_USERNAME }}
@@ -38,4 +46,3 @@ jobs:
           git remote add hf "https://${HF_USERNAME}:${HF_TOKEN}@huggingface.co/${HF_USERNAME}/${HF_REPO}.git" 2>/dev/null || true
           # Mirror current branch to HF main
           git push --force --prune hf HEAD:main
-