check node version

.buildkite/pipeline.yml

@@ -42,6 +42,7 @@ steps:
     commands:
       # force the NPM registry as the default on CI is artifactory, which can't
       # currently install from our lockfile
+      - node -v
       - npm ci --registry https://registry.npmjs.org
       # - cd test/aws-lambda
       # - bundle install