ci: deploy docs

Author: bcho

.github/workflows/docs-pages.yml

@@ -0,0 +1,56 @@
+name: Docs (GitHub Pages)
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+          cache-dependency-path: docs-starlight/package-lock.json
+      - name: Configure Pages
+        uses: actions/configure-pages@v5
+      - name: Install D2
+        run: curl -fsSL https://d2lang.com/install.sh | sh -s --
+      - name: Install dependencies
+        run: npm ci
+        working-directory: docs-starlight
+      - name: Build site
+        run: npm run build
+        working-directory: docs-starlight
+        env:
+          SITE: https://${{ github.repository_owner }}.github.io/${{ github.event.repository.name }}/
+          BASE: /${{ github.event.repository.name }}/
+      - name: Upload Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs-starlight/dist
+
+  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

docs-starlight/astro.config.mjs

@@ -6,7 +6,12 @@ import starlightThemeRapide from "starlight-theme-rapide";
 import d2 from "astro-d2";
 
 // https://astro.build/config
+const site = process.env.SITE;
+const base = process.env.BASE;
+
 export default defineConfig({
+  site,
+  base,
   integrations: [
     starlight({
       plugins: [starlightThemeRapide()],