Expose GitLab features to the CI runner

app/models/ci/build.rb

@@ -229,6 +229,10 @@ module Ci
       variables
     end
+    def features
+      { trace_sections: true }
+    end
+
     def merge_request
       return @merge_request if defined?(@merge_request)

lib/api/entities.rb

@@ -1020,6 +1020,7 @@ module API
         expose :cache, using: Cache
         expose :credentials, using: Credentials
         expose :dependencies, using: Dependency
+        expose :features
       end
     end

spec/requests/api/runner_spec.rb

@@ -360,6 +360,8 @@ describe API::Runner do
                'policy' => 'pull-push' }]
           end
+          let(:expected_features) { { 'trace_sections' => true } }
+
           it 'picks a job' do
             request_job info: { platform: :darwin }
@@ -379,6 +381,7 @@ describe API::Runner do
             expect(json_response['artifacts']).to eq(expected_artifacts)
             expect(json_response['cache']).to eq(expected_cache)
             expect(json_response['variables']).to include(*expected_variables)
+            expect(json_response['features']).to eq(expected_features)
           end
           context 'when job is made for tag' do