chore: Set working directory for frontend build

This commit updates the GitHub Actions workflow to set the working directory explicitly for the build job. This ensures that subsequent commands are executed within the correct directory, improving the build process.

.github/workflows/nuxtjs.yml

@@ -28,11 +28,12 @@ jobs:
   # Build job
   build:
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./frontend
     steps:
       - name: Checkout
         uses: actions/checkout@v3
-      - name: Navigate to frontend directory
-        run: cd frontend
       - name: Detect package manager
         id: detect-package-manager
         run: |