WIP: ci: configuration to build-deploy main docs to GitHub Pages

.github/workflows/documentation.yml

@@ -0,0 +1,108 @@
+name: Documentation
+
+on:
+  push:
+  pull_request:
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+
+# 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-main-documentation:
+    runs-on: ubuntu-22.04
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.x'
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r docs/requirements.txt
+
+    - name: Build documentation
+      run: |
+        cd docs/
+        make html
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: main-documentation
+        path: docs/_build/html
+
+  build-package-documentation:
+    runs-on: ubuntu-22.04
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Free Disk Space (Ubuntu)
+      uses: jlumbroso/free-disk-space@main
+
+    - name: Pull latest Docker images
+      run: |
+        ./src/docker/pull.sh
+
+    - uses: actions/setup-node@v4
+      with:
+        node-version: '20'
+
+    - name: Install
+      uses: pnpm/action-setup@v2
+      with:
+        version: 8
+        run_install: true
+
+    - name: Build itk-wasm
+      run: |
+        pnpm build
+
+  consolidate-documentation:
+    needs: build-main-documentation
+    runs-on: ubuntu-22.04
+
+    steps:
+    - name: Download main documentation
+      uses: actions/download-artifact@v4
+      with:
+        name: main-documentation
+        path: docs
+
+    - name: Upload Pages artifact
+      uses: actions/upload-pages-artifact@v3
+      with:
+        path: docs
+
+  deploy-gh-pages:
+    needs: consolidate-documentation
+    runs-on: ubuntu-22.04
+
+    # Grant GITHUB_TOKEN the permissions required to make a Pages deployment
+    permissions:
+      contents: read
+      pages: write      # to deploy to Pages
+      id-token: write   # to verify the deployment originates from an appropriate source
+
+    # Deploy to the github-pages environment
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+    - name: Deploy to GitHub Pages
+      id: deployment
+      uses: actions/deploy-pages@v4
+      # with:
+        # preview: true <-> currently not available to the public