feat(task): task enqueueing a maintenance task runnable on deploy

spec/tasks/maintenance/concerns/runnable_on_deploy_concern_spec.rb

@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Maintenance::RunnableOnDeployConcern do
+  let(:test_class) do
+    Class.new do
+      include Maintenance::RunnableOnDeployConcern
+    end
+  end
+
+  describe '.run_on_deploy?' do
+    context 'when run_on_first_deploy is not set' do
+      it 'returns false' do
+        expect(test_class.run_on_deploy?).to be false
+      end
+    end
+
+    context 'when run_on_first_deploy is set' do
+      before do
+        test_class.run_on_first_deploy
+        allow(MaintenanceTasks::TaskDataShow).to receive(:new).and_return(task_data_show)
+      end
+
+      let(:task_data_show) { instance_double(MaintenanceTasks::TaskDataShow, completed_runs: completed_runs, active_runs: active_runs) }
+      let(:completed_runs) { double(ActiveRecord::Relation, not_errored: not_errored_runs) }
+      let(:active_runs) { [] }
+      let(:not_errored_runs) { [] }
+
+      context 'when there are no run yet' do
+        it 'returns true' do
+          expect(test_class.run_on_deploy?).to be true
+        end
+      end
+
+      context 'when there are completed runs without errors' do
+        let(:not_errored_runs) { [instance_double(MaintenanceTasks::Run)] }
+
+        it 'returns false' do
+          expect(test_class.run_on_deploy?).to be false
+        end
+      end
+
+      context 'when there are active runs' do
+        let(:active_runs) { [instance_double(MaintenanceTasks::Run)] }
+
+        it 'returns false' do
+          expect(test_class.run_on_deploy?).to be false
+        end
+      end
+    end
+  end
+end