Added `sudo` to system level commands `apt-get update` and `apt-get install` in script example

doc/ci/quick_start/README.md

@@ -83,7 +83,7 @@ Below is an example for a Ruby on Rails project:
 image: "ruby:2.5"
 
 before_script:
-  - apt-get update -qq && apt-get install -y -qq sqlite3 libsqlite3-dev nodejs
+  - sudo apt-get update -qq && sudo apt-get install -y -qq sqlite3 libsqlite3-dev nodejs
   - ruby -v
   - which ruby
   - gem install bundler --no-document