ci(deploy_to_gh_pages): add working dir

Author: mikyll

.github/workflows/deploy_to_gh_pages.yml

@@ -9,6 +9,9 @@ jobs:
 
   build:
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: /app-mobile/flutter_application
     # needs: test
 
     steps:
@@ -34,6 +37,9 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     needs: build
+    defaults:
+      run:
+        working-directory: /app-mobile/flutter_application
 
     permissions:
       pages: write