Revise CI

- deploy using GitLab pages
- use jekyll image rather than installing loads of stuff manually
- gzip static resources for better performance

.gitlab-ci.yml

@@ -1,21 +1,28 @@
-image: ruby:2.4
-
 stages:
   - deploy
 
-deploy:
+variables:
+  GIT_DEPTH: 1
+
+
+pages:
+  image: jekyll/jekyll:3.6
   stage: deploy
-  before_script:
-    - apt-get update -y
-    - apt-get -y install rsync
-    - gem install jekyll -v 3.6.0
-    - eval $(ssh-agent -s)
   script:
+    - rm Gemfile
     - jekyll build -d public
-    - ssh-add <(echo "$SSH_PRIVATE_KEY")
-    - rsync -rvz --delete -e 'ssh -o StrictHostKeyChecking=no' ./public/ "$SERVER_USER"@autonomic.zone:/var/www/autonomic.zone/html/
+    - apk add gzip --update-cache --repository http://dl-3.alpinelinux.org/alpine/edge/testing/ --allow-untrusted
+    - gzip -v -k -6 $(find public -name '*.js' -o -name '*.html' -o -name '*.css')
   artifacts:
     paths:
       - public
   only:
     - master
+
+
+test with latest jekyll:
+  image: jekyll/jekyll:latest
+  stage: deploy
+  script:
+    - rm Gemfile
+    - jekyll build -d public