CI: Generate and publish documentation

.github/workflows/documentation.yml

@@ -0,0 +1,55 @@
+name: documentation
+
+# Controls when the action will run.
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: [main]
+  release:
+    # A release, pre-release, or draft of a release is published.
+    types: [published]
+  # 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:
+  # The introduction just shows some useful informations.
+  intro:
+    # The type of runner that the job will run on.
+    runs-on: ubuntu-latest
+    # Steps represent a sequence of tasks that will be executed as part of the job.
+    steps:
+      - run: echo "The job was automatically triggered by a ${{ github.event_name }} event."
+      - run: echo "The name of the branch is ${{ github.ref }} and the repository is ${{ github.repository }}."
+
+  # The build job will build the documentation.
+  build:
+    # The type of runner that the job will run on.
+    runs-on: ubuntu-latest
+    needs: intro
+    permissions:
+      contents: write
+
+    # Steps represent a sequence of tasks that will be executed as part of the job.
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up graphviz
+        uses: ts-graphviz/setup-graphviz@v2
+
+      - name: Set up doxygen and generate documentation
+        uses: mattnotmitt/doxygen-action@v1.9.8
+        with:
+          working-directory: "./doc/doxygen"
+          doxyfile-path: "./Doxyfile"
+
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v4
+        if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+        with:
+          publish_branch: gh-pages
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: doc/api/html
+          force_orphan: true