feat(ci): add deploy workflow

Signed-off-by: Alex Chi <[email protected]>

Author: skyzh

.github/workflows/deploy.yml

@@ -0,0 +1,36 @@
+
+name: Deploy
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+    inputs:
+      reason:
+        description: 'why this workflow is triggered'     
+        required: true
+        default: 'manually deploy site'
+
+jobs:
+  deploy_gh_pages:
+    name: Deploy to GitHub Pages
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+      - name: Install mdbook
+        run: cargo install mdbook mdbook-toc
+      - name: Build docs
+        working-directory: ./docs
+        run: mdbook build
+      - name: Deploy to GitHub Pages
+        if: ${{ github.ref == 'refs/heads/main' }}
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          publish_dir: ./docs/book
+          user_name: 'github-actions[bot]'
+          user_email: 'github-actions[bot]@users.noreply.github.com'
+          force_orphan: true