Add GHA CI to build and deploy docs

.github/workflows/docs.yml

@@ -0,0 +1,45 @@
+name: Build documentation
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Install python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.x
+      - name: Setup cache
+        uses: actions/cache@v2
+        with:
+          key: ${{ github.ref }}
+          path: .cache
+      - name: Setup dependencies
+        run: pip install mkdocs-material pillow cairosvg mkdocs-minify-plugin
+      - name: Build docs
+        run: mkdocs build
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v1
+        with:
+          path: ./site
+  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@v1

.gitignore

@@ -35,3 +35,7 @@ result
 .direnv/
 
 integration_test/etc/config.dump.yaml
+
+# MkDocs
+.cache
+/site