[CI] Add a "rebuild needed" check

Author: ViliusSutkus89

.github/workflows/build-test.yml

@@ -26,6 +26,9 @@ jobs:
 
       - run: npm run build
 
+      - name: Check if dist/index.js needs to be rebuilt
+        run: git status dist/index.js | grep "nothing to commit, working tree clean" -q
+
   format-check:
     runs-on: ubuntu-latest
     steps: