ci: add doc workflow

GitHub Actions to build and deploy doc to gh-pages.

.editorconfig

@@ -11,5 +11,5 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[*.json]
+[*.{json,yaml}]
 indent_size = 2

.github/workflows/doc.yaml

@@ -0,0 +1,40 @@
+name: Build doc
+
+on:
+  push:
+    branches: [$default-branch]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Cancel the previous run if it's still in progress
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Generate docs with LDoc
+        uses: lunarmodules/ldoc@v1.5.0
+      - name: Upload static files as artifact
+        id: deployment
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: doc/
+  deploy:
+    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