Add github action

.github/workflows/build.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v4
+      with:
+        python-version: '3.11'
+    - run: pip install -r requirements.txt
+    - run: make sphinx
+    # Publish built docs to gh-pages branch.
+    - name: Commit documentation changes
+      run: |
+        git clone https://github.com/wdv4758h/notes.git --depth 1 --branch gh-pages --single-branch gh-pages
+        rm -rf gh-pages/*
+        cp -r _build/html/* gh-pages/
+        cd gh-pages
+        touch .nojekyll
+        git config --local user.email "action@github.com"
+        git config --local user.name "GitHub Action"
+        git add .
+        git commit -m "Update documentation" -a || true
+        # The above command will fail if no changes were present, so we ignore that.
+    - name: Push changes
+      uses: ad-m/github-push-action@master
+      with:
+        branch: gh-pages
+        directory: gh-pages
+        github_token: ${{ secrets.GITHUB_TOKEN }}

requirements.txt

@@ -1,4 +1,4 @@
-sphinx==2.3.0
-readthedocs-sphinx-ext==1.0.1
-sphinx_rtd_theme==0.4.3
-ghp-import==0.5.5
+sphinx==6.2.1
+readthedocs-sphinx-ext==2.2.2
+sphinx_rtd_theme==1.2.2
+ghp-import==2.1.0