First draft commit for automatic C++ documentation.

.github/workflows/documentation.yml

@@ -0,0 +1,48 @@
+# This is a basic workflow to help you get started with Actions
+name: Build documentation
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the master branch
+  push:
+    branches: [ main ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    permissions:
+      id-token: write
+      pages: write
+      contents: write
+
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Setup python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.8'
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0 # otherwise, you will failed to push refs to dest repo
+      - name: Setup dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install python3-sphinx pandoc doxygen
+          python -m pip install --upgrade pip
+          python -m pip install sphinx_rtd_theme unidecode nbsphinx wheel breathe exhale
+      - name: Build and commit
+        uses: sphinx-notes/pages@v2
+        with:
+          documentation_path: './docs'
+      - name: Push documentation
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          branch: gh-pages