Add jekyll step to build pipeline

.drone.yml

@@ -2,7 +2,7 @@ name: test
 kind: pipeline
 
 steps:
-  - name: build
+  - name: jekyll-build
     image: ruby
     commands:
       - gem install bundler
@@ -18,7 +18,13 @@ name: build
 kind: pipeline
 
 steps:
-  - name: publish
+  - name: jekyll-build
+    image: ruby
+    commands:
+      - gem install bundler
+      - bundle install
+      - bundle exec jekyll build
+  - name: docker-build
     image: plugins/docker
     settings:
       pull_image: true