Add DestroyService for GPG keys and use for deleting gpg keys via API

app/services/gpg_keys/destroy_service.rb

+# frozen_string_literal: true
+
+module GpgKeys
+  class DestroyService < Keys::BaseService
+    def execute(key)
+      key.destroy
+    end
+  end
+end

lib/api/users.rb

@@ -374,9 +374,10 @@ module API
         key = user.gpg_keys.find_by(id: params[:key_id])
         not_found!('GPG Key') unless key
 
-        key.destroy
-
-        no_content!
+        destroy_conditionally!(key) do |key|
+          destroy_service = ::GpgKeys::DestroyService.new(current_user)
+          destroy_service.execute(key)
+        end
       end
       # rubocop: enable CodeReuse/ActiveRecord
 

spec/services/gpg_keys/destroy_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe GpgKeys::DestroyService do
+  let(:user) { create(:user) }
+
+  subject { described_class.new(user) }
+
+  it 'destroys the GPG key' do
+    gpg_key = create(:gpg_key)
+
+    expect { subject.execute(gpg_key) }.to change(GpgKey, :count).by(-1)
+  end
+end