Create gh-pages.yml

.github/workflows/gh-pages.yml

@@ -0,0 +1,24 @@
+name: github pages
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  deploy:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Build mdbook
+        run: cargo install mdbook        
+        
+      - name: Build
+        run: mdbook build
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          deploy_key: ${{ secrets.ACTIONS_DEPLOY_KEY }}
+          publish_dir: ./book