Fix working directory and artifact path in LaTeX workflow

.github/workflows/main.yml

@@ -12,16 +12,23 @@ jobs:
     steps:
       - name: Set up Git repository
         uses: actions/checkout@v4.2.2
+        with:
+          path: /Tesi
 
       - name: Compile LaTeX document
         uses: xu-cheng/latex-action@3.2.0
         with:
           root_file: Tesi.tex
           docker_image: ghcr.io/xu-cheng/texlive-full:20250101
+          working_directory: /Tesi
+
+      - name: Check LaTeX compilation
+        run: |
+          file Tesi.pdf | grep -q ' PDF '
 
       - name: Upload PDF file
         if: github.ref == 'refs/heads/main'
         uses: actions/upload-artifact@v4.6.0
         with:
           name: PDF
-          path: Tesi.pdf
+          path: /Tesi/Tesi.pdf