Add GHCI (#613)

.github/workflows/ci.yml

@@ -0,0 +1,14 @@
+name: Beautiful Jekyll CI
+on: [push, pull_request]
+jobs:
+  build:
+    name: Build Jekyll
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build the site in the jekyll/builder container
+        run: |
+          docker run \
+          -v ${{ github.workspace }}:/srv/jekyll -v ${{ github.workspace }}/_site:/srv/jekyll/_site \
+          -e PAGES_REPO_NWO=${{ github.repository }} \
+          jekyll/builder:latest /bin/bash -c "chmod 777 /srv/jekyll && jekyll build --future"