Add mdbook deployment workflow

Author: udzura

.github/workflows/deploy-docs.yml

@@ -0,0 +1,47 @@
+name: Deploy Documentation to GitHub Pages
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - 'uzumibi-docs/**'
+      - '.github/workflows/deploy-docs.yml'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup mdBook
+        uses: peaceiris/actions-mdbook@v2
+        with:
+          mdbook-version: 'latest'
+
+      - name: Build documentation
+        run: |
+          cd uzumibi-docs
+          mdbook build
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./uzumibi-docs/book
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4