Add stress test workflow (#13937)

Co-authored-by: Liangsheng Yin <hnyls2002@gmail.com>

.github/workflows/stress-test.yml

@@ -0,0 +1,44 @@
+name: Stress Test
+
+on:
+  workflow_dispatch:
+    inputs:
+      num_prompts:
+        description: 'Number of prompts per model'
+        required: true
+        default: '50000'
+        type: string
+      duration_minutes:
+        description: 'Timeout per model in minutes'
+        required: true
+        default: '45'
+        type: string
+
+jobs:
+  stress-test:
+    if: github.repository == 'sgl-project/sglang'
+    runs-on: 8-gpu-h200
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: |
+          bash scripts/ci/ci_install_dependency.sh
+
+      - name: Run stress tests
+        timeout-minutes: 210
+        env:
+          NUM_PROMPTS: ${{ inputs.num_prompts }}
+          DURATION_MINUTES: ${{ inputs.duration_minutes }}
+        run: |
+          cd test
+          python3 run_suite.py --hw cuda --suite stress
+
+      - name: Upload results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: stress-test-results
+          path: |
+            stress_test_*.jsonl