fix exploration merge (#7247)

build/azure-pipelines/exploration-merge.yml

@@ -3,12 +3,15 @@ trigger:
     include: ['master']
 pr: none
 
-steps:
-- task: NodeTool@0
+jobs:
+  - job: Exploration Merge
+    container: ubuntu:16.04
+    steps:
+      - task: NodeTool@0
         inputs:
           versionSpec: "10.15.1"
 
-- script: |
+      - script: |
           set -e
 
           git config user.email "andresse@microsoft.com"