ci: add tree to explain path

Author: aeweda

.github/workflows/main.yml

@@ -334,6 +334,10 @@ jobs:
       - name: Binary(ipa)
         run: flutter build ipa --release --export-options-plist=./ios/export_options.plist
 
+      - name: File structure
+        working-directory: build
+        run: brew install tree && tree
+
       - name: Release on App-Store
         working-directory: ios
         run: if [[ "${{github.ref_name}}" == *"dev"* ]]; then bundle exec fastlane beta; else bundle exec fastlane production; fi;