add action to generate pdf from latex

.gitea/actions/actions.yaml

@@ -0,0 +1,19 @@
+name: Generate and publish Document
+on: [ push ]
+
+jobs:
+  generate-and-publish:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Set up Git repository
+        uses: actions/checkout@v4
+      - name: Compile LaTeX document
+        uses: xu-cheng/latex-action@v3
+        with:
+          root_file: main.tex
+      - name: Upload PDF file
+        uses: actions/upload-artifact@v4
+        with:
+          name: PDF
+          path: main.pdf