feat: add blackwell workflow (#5303)

.github/workflows/release-docker-blackwell.yml

@@ -0,0 +1,36 @@
+name: Build Blackwell Docker Image
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  build-dev:
+    if: ${{ github.repository == 'sgl-project/sglang' }}
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Free disk space
+        uses: jlumbroso/free-disk-space@main
+        with:
+          tool-cache: false
+          docker-images: false
+          android: true
+          dotnet: true
+          haskell: true
+          large-packages: true
+          swap-storage: false
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and Push Blackwell Image
+        run: |
+          docker build . -f docker/Dockerfile.blackwell -t lmsysorg/sglang:blackwell --no-cache
+          docker push lmsysorg/sglang:blackwell