build and deploy workflow

.github/workflows/build-deploy.yml

@@ -0,0 +1,31 @@
+name: Build and Deploy
+
+on:
+    push:
+        branches:
+            - master
+
+jobs:
+    build:
+        runs-on: ubuntu-latest
+
+        steps:
+        - name: Checkout code
+            uses: actions/checkout@v2
+
+        - name: Set up Ruby
+            uses: ruby/setup-ruby@v1
+            with:
+                ruby-version: '2.7'
+
+        - name: Install dependencies
+            run: bundle install
+
+        - name: Build site
+            run: bundle exec jekyll build
+
+        - name: Deploy to GitHub Pages
+            uses: peaceiris/actions-gh-pages@v3
+            with:
+                github_token: ${{ secrets.GITHUB_TOKEN }}
+                publish_dir: ./_site