Add smoke test workflow for runner validation

.github/workflows/smoke.yml

@@ -0,0 +1,13 @@
+name: Runner smoke
+on:
+  workflow_dispatch:
+jobs:
+  hello:
+    runs-on: arc-runner-set
+    steps:
+      - uses: actions/checkout@v4
+      - run: |
+        echo "runner: $RUNNER_NAME  os: $RUNNER_OS"
+        python3 --version || echo "no python3 on PATH"
+        node --version   || echo "no node on PATH"
+        bash --version | head -1