Swap FK ci_resource_groups to projects for LFK

Removes FK for ci_resource_groups to projects

Changelog: changed

db/post_migrate/20220113014438_remove_projects_ci_resource_groups_project_id_fk.rb

+# frozen_string_literal: true
+
+class RemoveProjectsCiResourceGroupsProjectIdFk < Gitlab::Database::Migration[1.0]
+  disable_ddl_transaction!
+
+  def up
+    with_lock_retries do
+      remove_foreign_key_if_exists(:ci_resource_groups, :projects, name: "fk_774722d144")
+    end
+  end
+
+  def down
+    add_concurrent_foreign_key(:ci_resource_groups, :projects, name: "fk_774722d144", column: :project_id, target_column: :id, on_delete: "cascade")
+  end
+end

db/schema_migrations/20220113014438

+08d8a5a605058598a2f033bbd461518c502fb3da8627240c5d66f887b43f3ac3
\ No newline at end of file

db/structure.sql

@@ -29369,9 +29369,6 @@ ALTER TABLE ONLY vulnerabilities
 ALTER TABLE ONLY oauth_openid_requests
     ADD CONSTRAINT fk_77114b3b09 FOREIGN KEY (access_grant_id) REFERENCES oauth_access_grants(id) ON DELETE CASCADE;
 
-ALTER TABLE ONLY ci_resource_groups
-    ADD CONSTRAINT fk_774722d144 FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE;
-
 ALTER TABLE ONLY users
     ADD CONSTRAINT fk_789cd90b35 FOREIGN KEY (accepted_term_id) REFERENCES application_setting_terms(id) ON DELETE CASCADE;
 

lib/gitlab/database/gitlab_loose_foreign_keys.yml

+---
 dast_site_profiles_pipelines:
   - table: ci_pipelines
     column: ci_pipeline_id
@@ -38,6 +39,10 @@ ci_pending_builds:
   - table: namespaces
     column: namespace_id
     on_delete: async_delete
+ci_resource_groups:
+  - table: projects
+    column: project_id
+    on_delete: async_delete
 ci_runner_namespaces:
   - table: namespaces
     column: namespace_id

spec/models/ci/resource_group_spec.rb

@@ -3,6 +3,11 @@
 require 'spec_helper'
 
 RSpec.describe Ci::ResourceGroup do
+  it_behaves_like 'cleanup by a loose foreign key' do
+    let!(:parent) { create(:project) }
+    let!(:model) { create(:ci_resource_group, project: parent) }
+  end
+
   describe 'validation' do
     it 'valids when key includes allowed character' do
       resource_group = build(:ci_resource_group, key: 'test')