ci(docs): add pages workflow

Author: masterkain

.dockerignore

@@ -1,6 +1,7 @@
 /_build/
 /deps/
 /assets/node_modules/
+/docs-site/
 /.elixir_ls/
 /.git/
 /cover/

.github/workflows/docs.yml

@@ -0,0 +1,84 @@
+name: docs
+
+on:
+  pull_request:
+  push:
+  workflow_dispatch:
+
+concurrency:
+  group: docs-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: '26.2.0'
+          cache: npm
+          cache-dependency-path: docs-site/package-lock.json
+
+      - name: Install docs dependencies
+        run: npm ci --prefix docs-site
+
+      - name: Check docs
+        run: npm run check --prefix docs-site
+
+      - name: Build docs
+        run: npm run build --prefix docs-site
+
+  deploy:
+    if: ${{ github.event_name == 'workflow_dispatch' || (github.event_name == 'push' && github.ref == 'refs/heads/main') }}
+    needs: check
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: '26.2.0'
+          cache: npm
+          cache-dependency-path: docs-site/package-lock.json
+
+      - name: Install docs dependencies
+        run: npm ci --prefix docs-site
+
+      - name: Check docs
+        run: npm run check --prefix docs-site
+
+      - name: Build docs
+        run: npm run build --prefix docs-site
+
+      - name: Configure Pages
+        uses: actions/configure-pages@v6.0.0
+
+      - name: Upload Pages artifact
+        uses: actions/upload-pages-artifact@v5.0.0
+        with:
+          path: docs-site/dist
+
+      - name: Deploy Pages
+        id: deployment
+        uses: actions/deploy-pages@v5.0.0

.gitignore

@@ -62,6 +62,11 @@ codex_pooler-*.tar
 # In case you use Node.js/npm, you want to ignore these.
 npm-debug.log
 /assets/node_modules/
+
+# Generated docs-site artifacts.
+docs-site/node_modules/
+docs-site/dist/
+docs-site/.astro/
 # macOS Finder metadata.
 .DS_Store