Adds mergedYaml to configResolver

* updates specs

app/graphql/resolvers/ci/config_resolver.rb

@@ -29,6 +29,12 @@ module Resolvers
           .new(project: project, current_user: context[:current_user])
           .validate(content, dry_run: dry_run)
 
+        response(result).merge(merged_yaml: result.merged_yaml)
+      end
+
+      private
+
+      def response(result)
         if result.errors.empty?
           {
             status: :valid,
@@ -43,8 +49,6 @@ module Resolvers
         end
       end
 
-      private
-
       def make_jobs(config_jobs)
         config_jobs.map do |job|
           {

changelogs/unreleased/lm-add-merged-yaml.yml

+---
+title: 'GraphQL: Add mergedYaml to CiConfigResolver response'
+merge_request: 53081
+author:
+type: changed

spec/graphql/resolvers/ci/config_resolver_spec.rb

@@ -36,7 +36,8 @@ RSpec.describe Resolvers::Ci::ConfigResolver do
         File.read(Rails.root.join('spec/support/gitlab_stubs/gitlab_ci_includes.yml'))
       end
 
-      it 'lints the ci config file' do
+      it 'lints the ci config file and returns the merged yaml file' do
+        expect(response[:merged_yaml]).to eq(content)
         expect(response[:status]).to eq(:valid)
         expect(response[:errors]).to be_empty
       end