add missing .npmrc file using checkout

Author: bschnurr

build/templates/publish-extension.yml

@@ -165,6 +165,10 @@ jobs:
           type: releaseJob # This makes a job a release job
           isProduction: true # Indicates a production release
         steps:
+          - checkout: self
+            fetchDepth: 1
+            fetchTags: false
+
           - template: setup.yml
             parameters:
               installNode: true