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

.github/workflows/main.yml

@@ -9,19 +9,18 @@ on:
 jobs:
   build_latex:
     runs-on: ubuntu-latest
+    container: ubuntu:latest
     steps:
       - name: Set up Git repository
         uses: actions/checkout@v4.2.2
 
-      - 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
+      - name: Install LaTeX
+        run: sudo apt update && sudo apt install texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended
 
-      - name: Upload PDF file
-        if: github.ref == 'refs/heads/main'
-        uses: actions/upload-artifact@v4.6.0
+      - name: Build LaTeX document
+        run: pdflatex -interaction=nonstopmode -halt-on-error Tesi.tex
+
+      - name: Upload PDF artifact
+        uses: actions/upload-artifact@v4
         with:
-          name: PDF
-          path: Tesi.pdf
+          path: Test.pdf