Make Danger as for backend review for .gitlab-ci.yml

Signed-off-by: NRémy Coutable <remy@rymai.me>

lib/gitlab/danger/helper.rb

@@ -114,7 +114,7 @@ module Gitlab
         %r{\A(ee/)?spec/(?!javascripts)[^/]+} => :backend,
         %r{\A(ee/)?vendor/(?!assets)[^/]+} => :backend,
         %r{\A(ee/)?vendor/(languages\.yml|licenses\.csv)\z} => :backend,
-        %r{\A(Dangerfile|Gemfile|Gemfile.lock|Procfile|Rakefile)\z} => :backend,
+        %r{\A(Dangerfile|Gemfile|Gemfile.lock|Procfile|Rakefile|\.gitlab-ci\.yml)\z} => :backend,
         %r{\A[A-Z_]+_VERSION\z} => :backend,
 
         %r{\A(ee/)?db/} => :database,

spec/lib/gitlab/danger/helper_spec.rb

@@ -244,12 +244,13 @@ describe Gitlab::Danger::Helper do
       'vendor/languages.yml'    | :backend
       'vendor/licenses.csv'     | :backend
 
-      'Dangerfile'   | :backend
-      'Gemfile'      | :backend
-      'Gemfile.lock' | :backend
-      'Procfile'     | :backend
-      'Rakefile'     | :backend
-      'FOO_VERSION'  | :backend
+      'Dangerfile'     | :backend
+      'Gemfile'        | :backend
+      'Gemfile.lock'   | :backend
+      'Procfile'       | :backend
+      'Rakefile'       | :backend
+      '.gitlab-ci.yml' | :backend
+      'FOO_VERSION'    | :backend
 
       'ee/FOO_VERSION' | :unknown