Create book.yml

.github/workflows/book.yml

@@ -0,0 +1,22 @@
+name: Book
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  book:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: install elan
+      run: |
+        curl https://raw.githubusercontent.com/leanprover/elan/master/elan-init.sh -sSf | sh -s -- -y --default-toolchain $(cat lean-toolchain)
+        echo "$HOME/.elan/bin" >> $GITHUB_PATH
+
+    - name: build markdown files by mdgen
+      run: lake run build