Merge branch 'contributing-ci-templates' into 'master'

Include CONTRIBUTING.md file when importing .gitlab-ci.yml templates

See merge request !10653

lib/tasks/gitlab/update_templates.rake

@@ -44,7 +44,7 @@ namespace :gitlab do
     ),
     Template.new(
       "https://gitlab.com/gitlab-org/gitlab-ci-yml.git",
-      /(\.{1,2}|LICENSE|Pages|autodeploy|\.gitlab-ci.yml)\z/
+      /(\.{1,2}|LICENSE|CONTRIBUTING.md|Pages|autodeploy|\.gitlab-ci.yml)\z/
     )
   ].freeze
 

vendor/gitlab-ci-yml/CONTRIBUTING.md

+The canonical repository for `.gitlab-ci.yml` templates is
+https://gitlab.com/gitlab-org/gitlab-ci-yml.
+
+GitLab only mirrors the templates. Please submit your merge requests to 
+https://gitlab.com/gitlab-org/gitlab-ci-yml.