Revert "Remove unnecessary field"

This reverts commit dedcc7429b.

.pipelines/templates/jobs/build.yml

@@ -43,6 +43,7 @@ jobs:
     displayName: Setup NPM Authentication
     inputs:
       workingFile: $(Pipeline.Workspace)/vscode-website/server/.npmrc
+      customEndpoint: website npm feed
 
   - script: npm install
     displayName: Install dependencies