Implemented gitea action for automatic pdf build in main branch

.gitea/workflows/build_pdf.yaml

@@ -0,0 +1,25 @@
+name: Gitea Actions Demo
+run-name: ${{ gitea.actor }} is testing out Gitea Actions 🚀
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  Build-PDF:
+    runs-on: windows
+    steps:
+      - run: echo "The job was automatically triggered by a ${{ gitea.event_name }} event."
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - run: echo "The ${{ gitea.repository }} repository has been cloned to the runner."
+      - run: bash create_git_info_file.sh
+      - run: echo "Starting first LaTeX build"
+      - run: pdflatex fat.tex
+      - run: echo "Starting second LaTeX build"
+      - run: pdflatex fat.tex
+      - uses: actions/upload-artifact@v3
+        with:
+          name: fat
+          path: fat.pdf
+      - run: echo "This job's status is ${{ job.status }}."