first version of github actions

.github/workflows/build_latex.yml

@@ -0,0 +1,25 @@
+name: Build LaTeX document
+
+on:
+  push:
+     branches:
+       - test
+
+permissions:
+  contents: write
+
+jobs:
+  build_latex:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Git repository
+        uses: actions/checkout@v3
+      - name: Compile LaTeX document
+        uses: xu-cheng/latex-action@v3
+        with:
+          root_file: main.tex
+      - name: Upload PDF file
+        uses: actions/upload-artifact@v3
+        with:
+          name: PDF
+          path: main.pdf