Prevent retried builds from being retried again

Previously if a build were retried, we would still allow it to be
retried again. While this is convenient for running a build again, it
also means that a build can be retried again even if there is another
build running.

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/331361

Changelog: changed

app/models/ci/build.rb

@@ -469,7 +469,13 @@ def cancelable?
     end
     def retryable?
-      !archived? && (success? || failed? || canceled?)
+      if Feature.enabled?(:prevent_retry_of_retried_jobs, project, default_enabled: :yaml)
+        return false if retried? || archived?
+
+        success? || failed? || canceled?
+      else
+        !archived? && (success? || failed? || canceled?)
+      end
     end
     def retries_count

config/feature_flags/development/prevent_retry_of_retried_jobs.yml

+---
+name: prevent_retry_of_retried_jobs
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/62349
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/331695
+milestone: '14.0'
+type: development
+group: group::continuous integration
+default_enabled: false

spec/models/ci/build_spec.rb

@@ -1880,6 +1880,26 @@
           it { is_expected.not_to be_retryable }
         end
+
+        context 'when a canceled build has been retried already' do
+          before do
+            project.add_developer(user)
+            build.cancel!
+            described_class.retry(build, user)
+          end
+
+          context 'when prevent_retry_of_retried_jobs feature flag is enabled' do
+            it { is_expected.not_to be_retryable }
+          end
+
+          context 'when prevent_retry_of_retried_jobs feature flag is disabled' do
+            before do
+              stub_feature_flags(prevent_retry_of_retried_jobs: false)
+            end
+
+            it { is_expected.to be_retryable }
+          end
+        end
       end
     end