feat: add deploy action.

Author: ssp97

.github/workflows/deploy.yml

@@ -0,0 +1,47 @@
+name: Deploy Docs
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+concurrency:
+  group: deploy-docs
+  cancel-in-progress: true
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Prepare deploy files
+        shell: pwsh
+        run: ./scripts/prepare-deploy.ps1
+
+      - name: Build site
+        run: npm run build
+
+      - name: Deploy to deployment branch
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./build
+          publish_branch: deployment
+          force_orphan: true
+