ci: add prepack script to CI

Author: satya164

.github/workflows/build-templates.yml

@@ -174,6 +174,11 @@ jobs:
         run: |
           yarn test
 
+      - name: Build library
+        working-directory: ${{ env.work_dir }}
+        run: |
+          yarn prepack
+
       - name: Build example (Web)
         working-directory: ${{ env.work_dir }}
         if: matrix.language == 'js'