fix(ci): update vmbench runtime and stage benchmark artifacts

Signed-off-by: WenyXu <wenymedia@gmail.com>

.github/workflows/vmbench-long-range.yml

@@ -33,7 +33,7 @@ on:
       runtime_image:
         description: Aliyun runtime image (tag or digest reference)
         type: string
-        default: greptime-registry.cn-hangzhou.cr.aliyuncs.com/tools/o11ybench-runtime:20260917-4d3e9188@sha256:5cafb9f22a893350164c349f284f67164370f40c61f4bd2ab969390469c98723
+        default: greptime-registry.cn-hangzhou.cr.aliyuncs.com/tools/o11ybench-runtime:20260918-d83431f6@sha256:9226b3566965b24c090ecca64cd384b1789006c1ccfbadd64112a7c59747e80f
         required: true
       ecs_instance_type:
         description: ECS instance type (independent of Query Regression)
@@ -199,6 +199,7 @@ jobs:
       METADATA_ROOT: ${{ github.workspace }}/vmbench-metadata
       O11YBENCH_DIR: ${{ github.workspace }}/o11ybench
       TSDG_PARALLELISM: '8'
+      O11YBENCH_GENERATOR_CPUS: '4'
     steps:
     - name: Checkout matching benchmark tools
       uses: actions/checkout@v4
@@ -257,16 +258,24 @@ jobs:
       if: always()
       run: |
         docker ps -aq --filter "label=o11ybench.run-id=$RUN_ID-warm" | xargs -r docker rm -fv
+    - name: Stage benchmark artifacts
+      if: always()
+      run: |
+        mkdir -p "$RUNNER_TEMP/vmbench-artifacts"
+        if [[ -d "$METADATA_ROOT" ]]; then
+          rsync -a --no-owner --no-group "$METADATA_ROOT" "$RUNNER_TEMP/vmbench-artifacts/"
+        fi
+        if [[ -d "$ARTIFACT_ROOT-warm" ]]; then
+          # Exclude DB directories before traversal; they may be unreadable by the runner.
+          rsync -a --no-owner --no-group --exclude='db-data/' --exclude='/data/*.bin' \
+            "$ARTIFACT_ROOT-warm/" "$RUNNER_TEMP/vmbench-artifacts/$(basename "$ARTIFACT_ROOT-warm")/"
+        fi
     - name: Upload HTML and results (no dataset or DB files)
       if: always()
       uses: actions/upload-artifact@v4
       with:
         name: vmbench-long-range-${{ github.run_id }}-${{ github.run_attempt }}
-        path: |
-          ${{ env.METADATA_ROOT }}
-          ${{ env.ARTIFACT_ROOT }}-warm
-          !${{ env.ARTIFACT_ROOT }}-warm/data/*.bin
-          !${{ env.ARTIFACT_ROOT }}-warm/**/db-data/**
+        path: ${{ runner.temp }}/vmbench-artifacts
         if-no-files-found: warn
         retention-days: 14
   teardown: