test: add cpu-32 runner diagnostic workflow

This workflow tests the cpu-32-hk runner by:
- Checking buildctl installation timing
- Verifying Vault certificate injection
- Testing buildkitd connectivity
- Providing 5 minutes of sleep for manual pod inspection

Triggers on PR events (opened, synchronize, reopened) or push to test-cpu-32* branches.

Author: JavaPythonAIForBAT

.github/workflows/test-cpu-32-runner.yaml

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+#
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# This file is a part of the vllm-ascend project.
+#
+
+name: Test CPU-32 Runner
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+  push:
+    branches:
+      - 'test-cpu-32*'
+
+defaults:
+  run:
+    shell: bash -el {0}
+
+jobs:
+  test-cpu-32:
+    runs-on: linux-amd64-cpu-32-hk
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v7
+
+      - name: Print environment info
+        run: |
+          echo "=== System Information ==="
+          uname -a
+          echo ""
+          echo "=== CPU Information ==="
+          nproc
+          lscpu | head -20
+          echo ""
+          echo "=== Memory Information ==="
+          free -h
+          echo ""
+          echo "=== User and Groups ==="
+          whoami
+          id
+          echo ""
+          echo "=== Available tools ==="
+          which buildctl || echo "buildctl not found"
+          buildctl --version 2>/dev/null || echo "buildctl not available"
+          echo ""
+          echo "=== Environment Variables ==="
+          env | grep -E "BUILDKIT|DOCKER_CONFIG" || echo "No BUILDKIT/DOCKER_CONFIG env vars"
+
+      - name: Check buildctl availability
+        run: |
+          echo "=== Checking buildctl at job start ==="
+          which buildctl && echo "✅ buildctl found" || echo "❌ buildctl NOT found"
+          buildctl --version 2>/dev/null || echo "buildctl --version failed"
+
+          # Wait for buildctl if not available
+          if ! command -v buildctl &> /dev/null; then
+            echo "buildctl not found at start, waiting..."
+            for i in {1..60}; do
+              if command -v buildctl &> /dev/null; then
+                echo "✅ buildctl appeared after $i seconds"
+                break
+              fi
+              [ $((i % 10)) -eq 0 ] && echo "Waiting... ($i/60 sec)"
+              sleep 1
+            done
+          fi
+
+          # Verify buildctl is now available
+          if command -v buildctl &> /dev/null; then
+            echo "✅ buildctl is available"
+            buildctl --version
+          else
+            echo "❌ buildctl still not available after 60 seconds"
+            echo "This indicates a problem with the pod template or Vault injection"
+            exit 1
+          fi
+
+      - name: Test buildkitd connection
+        run: |
+          echo "=== Testing buildkitd connection ==="
+          echo "BUILDKITD_ADDR: ${BUILDKITD_ADDR:-not set}"
+          echo "DOCKER_CONFIG: ${DOCKER_CONFIG:-not set}"
+
+          if [ -n "$BUILDKITD_ADDR" ]; then
+            echo "Attempting to connect to buildkitd..."
+            buildctl du 2>&1 || echo "buildctl du command failed (may need certificates)"
+          else
+            echo "BUILDKITD_ADDR not set"
+          fi
+
+      - name: List available certificates
+        run: |
+          echo "=== Looking for certificates ==="
+          if [ -d "$HOME/.docker" ]; then
+            echo "Files in $HOME/.docker:"
+            ls -la "$HOME/.docker/"
+            echo ""
+            echo "File contents (first 100 chars):"
+            for f in "$HOME/.docker"/*; do
+              if [ -f "$f" ]; then
+                echo "--- $(basename $f) ---"
+                head -c 100 "$f"
+                echo ""
+              fi
+            done
+          else
+            echo "$HOME/.docker does not exist"
+          fi
+
+      - name: Keep pod running for debugging
+        run: |
+          echo "=== Pod will sleep for 5 minutes for debugging ==="
+          echo "You can now:"
+          echo "  kubectl exec -it <pod-name> -n vllm-project -c runner -- bash"
+          echo "To check:"
+          echo "  - which buildctl"
+          echo "  - ls -la ~/.docker/"
+          echo "  - env | grep BUILDKIT"
+          echo ""
+          sleep 300
+          echo "=== Debug time complete ==="
+
+      - name: Final verification
+        run: |
+          echo "=== Final Verification ==="
+          buildctl --version
+          echo "✅ Test completed successfully!"