[NVIDIA] Add CI workloads for GB200 (#12242)

.github/workflows/pr-test.yml

@@ -784,6 +784,35 @@ jobs:
           cd test/srt
           python3 run_suite.py --suite per-commit-4-gpu-b200 --auto-partition-id 0 --auto-partition-size 1 --timeout-per-file 3600
 
+  unit-test-backend-4-gpu-gb200:
+    needs: [check-changes, unit-test-backend-2-gpu, sgl-kernel-build-wheels]
+    if: always() && !failure() && !cancelled() &&
+      ((needs.check-changes.outputs.main_package == 'true') || (needs.check-changes.outputs.sgl_kernel == 'true'))
+    runs-on: 4-gpu-gb200
+    strategy:
+      fail-fast: false
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Download artifacts
+        if: needs.check-changes.outputs.sgl_kernel == 'true'
+        uses: actions/download-artifact@v4
+        with:
+          path: sgl-kernel/dist/
+          merge-multiple: true
+          pattern: wheel-python3.10-cuda12.9
+
+      - name: Install dependencies
+        run: |
+          CUSTOM_BUILD_SGL_KERNEL=${{needs.check-changes.outputs.sgl_kernel}} IS_BLACKWELL=1 bash scripts/ci/ci_install_dependency.sh
+
+      - name: Run test
+        timeout-minutes: 45
+        run: |
+          cd test/srt
+          python3 run_suite.py --suite per-commit-4-gpu-gb200 --auto-partition-id 0 --auto-partition-size 1 --timeout-per-file 3600
+
   pr-test-finish:
     needs:
       [
@@ -808,6 +837,7 @@ jobs:
         unit-test-deepep-4-gpu,
         unit-test-deepep-8-gpu,
         unit-test-backend-4-gpu-b200,
+        unit-test-backend-4-gpu-gb200,
       ]
     if: always()
     runs-on: ubuntu-latest