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

.github/workflows/main.yml

@@ -9,7 +9,6 @@ on:
 jobs:
   build_latex:
     runs-on: ubuntu-latest
-    container: ubuntu:latest
     steps:
       - name: Install Node.js
         run: |
@@ -29,7 +28,8 @@ jobs:
           miktexsetup --shared=yes finish
 
       - name: Build LaTeX document
-        run: pdflatex -interaction=nonstopmode -halt-on-error Tesi.tex
+        run: |
+          pdflatex -interaction=nonstopmode -halt-on-error Tesi.tex || (cat /root/.miktex/texmfs/data/miktex/log/pdflatex.log && exit 1)
 
       - name: Upload PDF artifact
         uses: actions/upload-artifact@v4