Change to plane Ruby image

.drone.yml

@@ -1,12 +1,22 @@
-workspace:
-  base: /srv/jekyll
-  path: /
-
 pipeline:
+  restore-cache:
+    image: drillster/drone-volume-cache
+    restore: true
+    mount:
+      - /drone/.bundle
+    volumes:
+      - /tmp/bundle-cache:/cache
   build:
-    image: jekyll/minimal:3.8.3
+    image: ruby:2.5.1-alpine3.7
+    environment:
+      - BUNDLE_PATH=/drone/.bundle
     commands:
-      - whoami
-      - cd ianonavy
-      - jekyll build
-    
+      - bundle install
+      - bundle exec jekyll build
+  rebuild-cache:
+    image: drillster/drone-volume-cache
+    rebuild: true
+    mount:
+      - /drone/.bundle
+    volumes:
+      - /tmp/bundle-cache:/cache