Add methods to save runner feature cancelable

This method adds getter/setter methods for the "cancelable" feature that
gets included in the job request payload from runner.

app/models/ci/build_metadata.rb

@@ -23,6 +23,7 @@ module Ci
 
     serialize :config_options, Serializers::SymbolizedJson # rubocop:disable Cop/ActiveRecordSerialize
     serialize :config_variables, Serializers::SymbolizedJson # rubocop:disable Cop/ActiveRecordSerialize
+    serialize :runtime_runner_features, Serializers::SymbolizedJson # rubocop:disable Cop/ActiveRecordSerialize
 
     chronic_duration_attr_reader :timeout_human_readable, :timeout
 
@@ -49,6 +50,14 @@ module Ci
       update(timeout: timeout.value, timeout_source: timeout.source)
     end
 
+    def set_cancel_gracefully
+      runtime_runner_features.merge!( { cancel_gracefully: true } )
+    end
+
+    def cancel_gracefully?
+      runtime_runner_features[:cancel_gracefully] == true
+    end
+
     private
 
     def set_build_project

app/models/concerns/ci/metadatable.rb

@@ -20,6 +20,8 @@ module Ci
       delegate :interruptible, to: :metadata, prefix: false, allow_nil: true
       delegate :has_exposed_artifacts?, to: :metadata, prefix: false, allow_nil: true
       delegate :environment_auto_stop_in, to: :metadata, prefix: false, allow_nil: true
+      delegate :set_cancel_gracefully, to: :metadata, prefix: false, allow_nil: false
+      delegate :cancel_gracefully?, to: :metadata, prefix: false, allow_nil: false
       before_create :ensure_metadata
     end
 

spec/models/ci/build_metadata_spec.rb

@@ -121,4 +121,16 @@ RSpec.describe Ci::BuildMetadata do
       end
     end
   end
+
+  describe 'set_cancel_gracefully' do
+    it 'sets cancel_gracefully' do
+      build.set_cancel_gracefully
+
+      expect(build.cancel_gracefully?).to be true
+    end
+
+    it 'returns false' do
+      expect(build.cancel_gracefully?).to be false
+    end
+  end
 end

spec/models/ci/build_spec.rb

@@ -35,6 +35,8 @@ RSpec.describe Ci::Build do
 
   it { is_expected.to respond_to(:has_trace?) }
   it { is_expected.to respond_to(:trace) }
+  it { is_expected.to respond_to(:set_cancel_gracefully) }
+  it { is_expected.to respond_to(:cancel_gracefully?) }
 
   it { is_expected.to delegate_method(:merge_request?).to(:pipeline) }
   it { is_expected.to delegate_method(:merge_request_ref?).to(:pipeline) }
@@ -5386,4 +5388,23 @@ RSpec.describe Ci::Build do
       create(:ci_build)
     end
   end
+
+  describe '#runner_features' do
+    subject do
+      build.save!
+      build.cancel_gracefully?
+    end
+
+    let_it_be(:build) { create(:ci_build, pipeline: pipeline) }
+
+    it 'cannot cancel gracefully' do
+      expect(subject).to be false
+    end
+
+    it 'can cancel gracefully' do
+      build.set_cancel_gracefully
+
+      expect(subject).to be true
+    end
+  end
 end