Add Antora playbook and test workflow.

Signed-off-by: Frank Ralf <[email protected]>

.github/workflows/antora-test.yml

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+# Source: https://docs.antora.org/antora/latest/publish-to-github-pages/ -  Example 2
+name: Publish to GitHub Pages
+on:
+  push:
+    branches: [antora-test]
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+concurrency:
+  group: github-pages
+  cancel-in-progress: false
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+    - name: Configure Pages
+      uses: actions/configure-pages@v3
+    - name: Install Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '18'
+    - name: Install Antora
+      run: npm i antora
+    - name: Generate Site
+      run: npx antora antora-playbook.yml
+    - name: Upload Artifacts
+      uses: actions/upload-pages-artifact@v2
+      with:
+        path: build/site
+    - name: Deploy to GitHub Pages
+      id: deployment
+      uses: actions/deploy-pages@v2

antora-playbook.yml

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+site:
+  title: ASAM OpenMATERIAL (GitHub)
+  url: https://my-asam-demo-site.org
+  start_page: asamopenmaterial:specification:index.adoc 
+
+content:
+  sources:
+  - url: https://github.com/asam-ev/OpenMATERIAL.git
+    branches: [antora-test] # ACHTUNG - aktuellen Branch eintragen! [main, v*.*.*]
+    tags: [v*,V*]
+    start_path: .antora
+  - url: https://code.asam.net/common/asam-terminology.git
+    start_path: .antora
+    tags: [v*,V*]
+
+ui:
+  bundle:
+    url: https://code.asam.net/common/antora-ui/-/jobs/artifacts/main/raw/build/ui-bundle.zip?job=bundle-stable
+    snapshot: true
+
+output:
+  clean: true
+  dir: ./build/site
+
+runtime:
+  fetch: true