Populate cluster_id when creating a deployment

app/models/concerns/deployable.rb

@@ -18,6 +18,7 @@ module Deployable
       return unless environment.persisted?
 
       create_deployment!(
+        cluster_id: environment.deployment_platform&.cluster_id,
         project_id: environment.project_id,
         environment: environment,
         ref: ref,

changelogs/unreleased/add-clusters-to-deployment.yml

+---
+title: Persist the cluster a deployment was deployed to
+merge_request: 29960
+author:
+type: fixed

spec/models/concerns/deployable_spec.rb

@@ -7,10 +7,6 @@ describe Deployable do
     let(:deployment) { job.deployment }
     let(:environment) { deployment&.environment }
 
-    before do
-      job.reload
-    end
-
     context 'when the deployable object will deploy to production' do
       let!(:job) { create(:ci_build, :start_review_app) }
 
@@ -26,6 +22,16 @@ describe Deployable do
       end
     end
 
+    context 'when the deployable object will deploy to a cluster' do
+      let(:project) { create(:project) }
+      let!(:cluster) { create(:cluster, :provided_by_user, projects: [project]) }
+      let!(:job) { create(:ci_build, :start_review_app, project: project) }
+
+      it 'creates a deployment with cluster association' do
+        expect(deployment.cluster).to eq(cluster)
+      end
+    end
+
     context 'when the deployable object will stop an environment' do
       let!(:job) { create(:ci_build, :stop_review_app) }