Creates audit event on approval rule creation

Record an audit event when user creates
a new MR approval rule. This event should
be visible under Project > Audit Events
and Admin Area > Audit Log

Changelog: changed
EE: true

ee/app/models/approval_project_rule.rb

@@ -15,6 +15,7 @@ class ApprovalProjectRule < ApplicationRecord
   has_and_belongs_to_many :protected_branches
   has_many :approval_merge_request_rule_sources
   has_many :approval_merge_request_rules, through: :approval_merge_request_rule_sources
+  after_create_commit :audit_creation
 
   enum rule_type: {
     regular: 0,
@@ -67,6 +68,10 @@ class ApprovalProjectRule < ApplicationRecord
     push_audit_event("Added #{model.class.name} #{model.name} to approval group on #{self.name} rule")
   end
 
+  def audit_creation
+    push_audit_event("Added approval rule with number of required approvals of #{approvals_required}")
+  end
+
   def audit_remove(model)
     push_audit_event("Removed #{model.class.name} #{model.name} from approval group on #{self.name} rule")
   end

ee/spec/models/approval_project_rule_spec.rb

@@ -300,6 +300,13 @@ RSpec.describe ApprovalProjectRule do
       it_behaves_like 'auditable'
     end
 
+    describe "#audit_creation after approval rule is created" do
+      let(:action!) { create(:approval_project_rule, approvals_required: 1) }
+      let(:message) {'Added approval rule with number of required approvals of 1'}
+
+      it_behaves_like 'auditable'
+    end
+
     describe '#vulnerability_states_for_branch' do
       let(:project) { create(:project, :repository) }
       let(:branch_name) { project.default_branch }