Add missing rsync

.gitlab-ci.yml

@@ -2,7 +2,8 @@ image: "ruby:2.3"
 before_script:
   - export PATH=~/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
-  - apt-get update
+  - apt update
+  - apt install rsync -y
   - gem install --bindir /usr/local/bin bundler
   - cp config.yml.example config.yml
   - bundle install