workflows: docs: add

Create a custom workflow for deploying our documentation to GitHub
Pages. This does two things:

1. Allows us to retain the original YAML-to-documentation generation
   process we've used
2. Stops us from relying solely on the main branch for documentation
   build and review.

AI-Generated: Uses Claude Sonnet 5

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>

Author: threexc

.github/workflows/docs.yml

@@ -0,0 +1,63 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+
+name: Build and deploy documentation
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "docs/**"
+  pull_request:
+    paths:
+      - "docs/**"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3'
+
+      - name: Install package doc generator dependencies
+        run: pip install -r docs/requirements.txt
+
+      - name: Generate package pages from YAML
+        run: python docs/packages/generate_packages_doc.py
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+
+      - name: Build with Jekyll
+        uses: actions/jekyll-build-pages@v1
+        with:
+          source: ./docs
+          destination: ./_site
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+
+  deploy:
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    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