Add step to update sgl-kernel whl index (#3110)

.github/workflows/release-whl-kernel.yml

@@ -42,6 +42,8 @@ jobs:
     needs: build-wheels
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
+
       - name: Download artifacts
         uses: actions/download-artifact@v4
         with:
@@ -57,3 +59,20 @@ jobs:
           token: ${{ secrets.WHL_TOKEN }}
           files: |
             sgl-kernel/dist/*
+
+      - name: Clone wheel index
+        run: git clone https://oauth2:${WHL_TOKEN}@github.com/sgl-project/whl.git sgl-whl
+        env:
+          WHL_TOKEN: ${{ secrets.WHL_TOKEN }}
+
+      - name: Update wheel index
+        run: python3 scripts/update_kernel_whl_index.py
+
+      - name: Push wheel index
+        run: |
+          cd sgl-whl
+          git config --local user.name "github-actions[bot]"
+          git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add -A
+          git commit -m "update whl index"
+          git push

scripts/update_kernel_whl_index.py

+# Reference: https://github.com/flashinfer-ai/flashinfer/blob/v0.2.0/scripts/update_whl_index.py
+
+import hashlib
+import pathlib
+import re
+
+for path in sorted(pathlib.Path("sgl-kernel/dist").glob("*.whl")):
+    with open(path, "rb") as f:
+        sha256 = hashlib.sha256(f.read()).hexdigest()
+    ver = re.findall(r"sgl_kernel-([0-9.]+(?:\.post[0-9]+)?)-", path.name)[0]
+    index_dir = pathlib.Path(f"sgl-whl/cu118")
+    index_dir.mkdir(exist_ok=True)
+    base_url = "https://github.com/sgl-project/whl/releases/download"
+    full_url = f"{base_url}/v{ver}/{path.name}#sha256={sha256}"
+    with (index_dir / "index.html").open("a") as f:
+        f.write(f'<a href="{full_url}">{path.name}</a><br>\n')