Create main.yml

.github/workflows/main.yml

@@ -0,0 +1,31 @@
+name: Github Actions CI to build pdf from tex source.
+on: push
+jobs:
+  build:
+    if: "!contains(github.event.head_commit.message, '[skip ci]')"
+
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+
+    steps:
+    - name: Set up Git repository
+      uses: actions/checkout@v2
+
+    - name: Compile LaTeX document
+      uses: xu-cheng/latex-action@v3
+      with:
+          root_file: main.tex
+          args: -pdf -file-line-error -halt-on-error -interaction=nonstopmode
+          pre_compile: tlmgr update --self && tlmgr update --all
+          post_compile: latexmk -c && mv main.pdf lecture_notes.pdf
+
+    - name: Check pdf file
+      run: |
+        file lecture_notes.pdf | grep -q ' PDF '
+    - name: Upload file to repository
+      uses: stefanzweifel/git-auto-commit-action@v4
+      with:
+          commit_message: Update lecture notes PDF
+          file_pattern: lecture_notes.pdf