Merge branch 'ci_danger' into 'master'

Adds a first pass at a ci config danger rule

See merge request gitlab-org/gitlab!75292

danger/ci_config/Dangerfile

+# frozen_string_literal: true
+
+all_changed_files = helper.all_changed_files
+
+def get_ci_config_files(files)
+  files.select do |file|
+    file.include?('gitlab/ci/config/entry')
+  end
+end
+
+schema_path = 'app/assets/javascripts/editor/schema/ci.json'
+has_schema_update = all_changed_files.include?(schema_path)
+return if has_schema_update
+
+ci_config_files = get_ci_config_files(all_changed_files)
+return if ci_config_files.empty?
+
+file_list = "- #{ci_config_files.map { |path| "`#{path}`" }.join("\n- ")}"
+
+warn "This merge request changed CI config files but did not update the schema. Please consider updating [the schema](#{schema_path}) to reflect these changes:\n#{file_list}"

spec/tooling/danger/project_helper_spec.rb

@@ -284,7 +284,7 @@ RSpec.describe Tooling::Danger::ProjectHelper do
 
   describe '.local_warning_message' do
     it 'returns an informational message with rules that can run' do
-      expect(described_class.local_warning_message).to eq('==> Only the following Danger rules can be run locally: changelog, database, documentation, duplicate_yarn_dependencies, eslint, gitaly, pajamas, pipeline, prettier, product_intelligence, utility_css, vue_shared_documentation')
+      expect(described_class.local_warning_message).to eq('==> Only the following Danger rules can be run locally: changelog, ci_config, database, documentation, duplicate_yarn_dependencies, eslint, gitaly, pajamas, pipeline, prettier, product_intelligence, utility_css, vue_shared_documentation')
     end
   end
 

tooling/danger/project_helper.rb

@@ -5,6 +5,7 @@ module Tooling
     module ProjectHelper
       LOCAL_RULES ||= %w[
         changelog
+        ci_config
         database
         documentation
         duplicate_yarn_dependencies