create and deploy Sphinx documentation for lib

The config file is largely based on GitHub's own examples:
https://github.com/actions/deploy-pages

Signed-off-by: Jiri Jaburek <[email protected]>

.github/workflows/pages.yaml

@@ -0,0 +1,55 @@
+name: Deploy documentation to GH Pages
+
+on:
+  # Runs on pushes targeting the default branch
+  push:
+    branches: ["main"]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# 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 job
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+      - name: Make test html page
+        run: |
+            python3 -m pip install sphinx sphinx-rtd-theme sphinx-autoapi
+            sphinx-quickstart -p Contest -a Fantomas -v 1 -r 1 -l en --sep \
+                --extensions sphinx.ext.githubpages,sphinx.ext.autodoc,autoapi.extension .
+            sed '/^html_theme = /s/.*/html_theme = "sphinx_rtd_theme"/' -i source/conf.py
+            sed '1i autoapi_dirs = ["../lib"]' -i source/conf.py
+            sed '1i autoapi_options = ["members", "undoc-members", "show-inheritance"]' -i source/conf.py
+            sphinx-build source build
+            mv build _site
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+
+  # Deployment job
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

README.md

@@ -127,6 +127,11 @@ These have some unfortunate metadata, such as
 
 which are removed by `translate_ssg_kickstart()` [in virt.py](lib/virt.py).
 
+## Referencing library code
+
+See https://rhsecuritycompliance.github.io/contest/ for online Sphinx version
+of the modules present in `lib`.
+
 ## Debugging
 
 (TODO: probably move to its own document?)