ci: add build jekyll action

.github/workflows/build-jekyll.yml

@@ -0,0 +1,32 @@
+name: Build and Deploy to Github Pages
+
+on:
+  push:
+    branches:
+      - master  # Here source code branch is `master`, it could be other branch
+
+jobs:
+  build_and_deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      # Use GitHub Actions' cache to cache dependencies on servers
+      - uses: actions/cache@v1
+        with:
+          path: vendor/bundle
+          key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-gems-
+
+      # Use GitHub Deploy Action to build and deploy to Github
+      - uses: jeffreytse/jekyll-deploy-action@master
+        with:
+          provider: 'github'
+          token: ${{ secrets.GH_TOKEN }} # It's your Personal Access Token(PAT)
+          repository: ''             # Default is current repository
+          branch: 'gh-pages'         # Default is gh-pages for github provider
+          jekyll_src: './'           # Default is root directory
+          jekyll_cfg: '_config.yml'  # Default is _config.yml
+          cname: ''                  # Default is to not use a cname
+          actor: ''                  # Default is the GITHUB_ACTOR