add paper workflow

Author: Mioriarty

.github/workflows/paper.yml

@@ -0,0 +1,37 @@
+name: Build LaTeX Paper
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'paper/**'
+      - '.github/workflows/paper.yml'
+  pull_request:
+    branches: [main]
+    paths:
+      - 'paper/**'
+      - '.github/workflows/paper.yml'
+  workflow_dispatch:
+
+jobs:
+  build-paper:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Compile LaTeX paper
+        uses: xu-cheng/latex-action@v3
+        with:
+          working_directory: paper
+          root_file: paper.tex
+          latexmk_use_xelatex: false
+          args: -pdf -file-line-error -halt-on-error -interaction=nonstopmode
+
+      - name: Upload paper PDF
+        uses: actions/upload-artifact@v4
+        with:
+          name: paper-pdf
+          path: paper/paper.pdf
+          if-no-files-found: error