Add member invitation reminder emails cron worker

Add worker configuration

app/workers/all_queues.yml

@@ -211,6 +211,14 @@
   :weight: 1
   :idempotent:
   :tags: []
+- :name: cronjob:member_invitation_reminder_emails
+  :feature_category: :subgroups
+  :has_external_dependencies:
+  :urgency: :low
+  :resource_boundary: :unknown
+  :weight: 1
+  :idempotent:
+  :tags: []
 - :name: cronjob:metrics_dashboard_schedule_annotations_prune
   :feature_category: :metrics
   :has_external_dependencies:

app/workers/member_invitation_reminder_emails_worker.rb

+# frozen_string_literal: true
+
+class MemberInvitationReminderEmailsWorker # rubocop:disable Scalability/IdempotentWorker
+  include ApplicationWorker
+  include CronjobQueue # rubocop:disable Scalability/CronWorkerContext
+
+  feature_category :subgroups
+  urgency :low
+
+  def perform
+    return unless Gitlab::Experimentation.enabled?(:invitation_reminders)
+
+    # To keep this MR small, implementation will be done in another MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/42981/diffs?commit_id=8063606e0f83957b2dd38d660ee986f24dee6138
+  end
+end

config/initializers/1_settings.rb

@@ -517,6 +517,9 @@ Settings.cron_jobs['ci_platform_metrics_update_cron_worker']['job_class'] = 'CiP
 Settings.cron_jobs['analytics_instance_statistics_count_job_trigger_worker'] ||= Settingslogic.new({})
 Settings.cron_jobs['analytics_instance_statistics_count_job_trigger_worker']['cron'] ||= '50 23 */1 * *'
 Settings.cron_jobs['analytics_instance_statistics_count_job_trigger_worker']['job_class'] ||= 'Analytics::InstanceStatistics::CountJobTriggerWorker'
+Settings.cron_jobs['member_invitation_reminder_emails_worker'] ||= Settingslogic.new({})
+Settings.cron_jobs['member_invitation_reminder_emails_worker']['cron'] ||= '0 0 * * *'
+Settings.cron_jobs['member_invitation_reminder_emails_worker']['job_class'] = 'MemberInvitationReminderEmailsWorker'
 
 Gitlab.ee do
   Settings.cron_jobs['adjourned_group_deletion_worker'] ||= Settingslogic.new({})

spec/workers/member_invitation_reminder_emails_worker_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe MemberInvitationReminderEmailsWorker do
+  describe '#perform' do
+    subject { described_class.new.perform }
+
+    context 'feature flag disabled' do
+      before do
+        stub_experiment(invitation_reminders: false)
+      end
+
+      it 'does not raise an error' do
+        expect { subject }.not_to raise_error
+      end
+    end
+
+    context 'feature flag enabled' do
+      before do
+        stub_experiment(invitation_reminders: true)
+      end
+
+      it 'does not raise an error' do
+        expect { subject }.not_to raise_error
+      end
+    end
+  end
+end