Use yarn for publishing

.gitlab-ci.yml

@@ -33,7 +33,7 @@ publish:
     - yarn
     - cd src/webview && yarn && yarn build && cd ../.. # build webview
     - yarn global add vsce
-    - vsce publish -p $AZURE_ACCESS_TOKEN
+    - vsce publish --yarn -p $AZURE_ACCESS_TOKEN
   when: manual
   only:
     - tags