add a 2.x docs build workflow

Signed-off-by: Karl W. Schulz <karl.schulz@amd.com>

.github/workflows/docs-2.x.yml

@@ -0,0 +1,56 @@
+name: Documentation
+
+on:
+  push:
+    branches: ["docpub"]
+    paths:
+      - 'src/docs'
+      - '.github/workflows/docs-2.x.yml'
+      - 'VERSION'
+
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  # Build job
+  build:
+    runs-on: ubuntu-latest
+    container:
+       image: sphinxdoc/sphinx
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Additional python packages
+        run: pip3 install -r requirements-doc.txt
+      - name: Setup Pages
+        uses: actions/configure-pages@v2
+      - name: Build html
+        run: |
+          cd src/docs
+          make html
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v1
+        with:
+          path: ./src/docs/_build/html
+
+##   # Deployment job
+##   deploy:
+##     environment:
+##       name: github-pages
+##       url: ${{ steps.deployment.outputs.page_url }}/2.x
+##     runs-on: ubuntu-latest
+##     needs: build
+##     steps:
+##       - name: Deploy to GitHub Pages
+##         id: deployment
+##         uses: actions/deploy-pages@v1
+