add action

.github/workflows/gh-pages.yml

@@ -0,0 +1,24 @@
+name: Build pages and publish
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/cache@v2
+      with:
+        path: vendor/bundle
+        key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile') }}
+        restore-keys: |
+          ${{ runner.os }}-gems-
+    - uses: helaili/jekyll-action@2.2.0
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}
+        target_branch: 'gh-pages'
+        jekyll_src: 'home'