Try to use .npmrc (#36)

.gitlab-ci.yml

@@ -23,7 +23,6 @@ publish:
 #      - publish
   script:
     - sudo npm install --global can-npm-publish
-    - yarn config set registry https://registry.npmjs.org/
     - yarn config set cache-folder "$CI_PROJECT_DIR/_yarn_cache"
     - yarn install
-    - npm run publish
+    - yarn run publish

packages/app-shell/.npmrc

+//registry.npmjs.org/:_authToken=${NPM_TOKEN}
\ No newline at end of file