Update npm-publish.yml

Author: jwo

.github/workflows/npm-publish.yml

@@ -28,6 +28,7 @@ jobs:
           node-version: 12
           registry-url: https://registry.npmjs.org/
       - run: npm ci
+      - run: npm build
       - run: npm publish
         env:
           NODE_AUTH_TOKEN: ${{secrets.npm_token}}