ci: Build/deploy documentation

Add a CI job to build and deploy our API documentation.

Signed-off-by: Sean Anderson <[email protected]>

.github/workflows/doc.yml

@@ -0,0 +1,39 @@
+name: Build and deploy documentation
+
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: pip install '.[doc,flask]'
+      - uses: actions/configure-pages@v2
+      - run: make htmldocs
+      - uses: actions/upload-pages-artifact@v1
+        with:
+          path: doc/out/html
+
+  deploy:
+    needs: build
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v1

setup.py

@@ -42,6 +42,10 @@ def build_extension(self, ext):
         'prometheus_client',
     ],
     extras_require = {
+        "doc": [
+            'sphinx',
+            'sphinx-rtd-theme',
+        ],
         "flask": [
             'prometheus_flask_exporter',
         ],