Publish docs as GitHub pages

.github/workflows/documentation.yml

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+# SPDX-FileCopyrightText: 2024 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
+#
+# SPDX-License-Identifier: LGPL-2.1-only OR LicenseRef-KDAB-KDStateMachineEditor
+
+name: Deploy doxygen to GitHub Pages
+
+on:
+  push:
+    branches:
+      - master
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Install Dependencies on Linux
+        run: |
+          sudo apt update -qq
+          sudo apt install -y doxygen
+
+      - name: Install Qt
+        uses: jurplel/install-qt-action@v3
+        with:
+          aqtversion: null # use whatever the default is
+          version: 5.15.2
+          cache: true
+
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Configure project
+        run: >
+          cmake -S . -B ./build
+          -DBUILD_QT6=OFF
+          -DBUILD_TESTS=OFF
+          -DBUILD_EXAMPLES=OFF
+          -DBUILD_DOCS=ON
+
+      - name: Create docs
+        run: cmake --build ./build --target docs
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: build/docs/api/html/
+
+  # Deployment job, what was uploaded to artifact
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4