chore(CI): add app compilation in CI to make sure we don't break it a…

…gain

.github/workflows/main.yml

@@ -26,8 +26,10 @@ jobs:
         run: yarn prettier:check
       - name: Check Readme
         run: yarn readme:check
-      - name: Build
+      - name: Build lib
         run: yarn lib:build:prod
+      - name: Build app
+        run: yarn demo:build:prod
       - name: Test
         run: yarn lib:test:ci
       - name: Coverage