Merge pull request #33 from microsoft/use-linux-pool

Use a linux pool for publishing.

common/config/azure-pipelines/npm-publish.yaml

@@ -29,6 +29,9 @@ extends:
       - stage:
         jobs:
           - job:
+            pool:
+              name: publish-rushstack
+              os: linux
             templateContext:
               outputs:
                 - output: pipelineArtifact