Refactor GitHub Actions workflow to install LaTeX dependencies and build document directly, updating artifact upload step

.github/workflows/main.yml

@@ -21,7 +21,9 @@ jobs:
         uses: actions/checkout@v4.2.2
 
       - name: Install LaTeX
-        run: apt-get install texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended -y
+        run: |
+          apt-get install miktex
+          miktexsetup --shared=yes finish
 
       - name: Build LaTeX document
         run: pdflatex -interaction=nonstopmode -halt-on-error Tesi.tex