You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: housekeeping_service.rb
    path of file: ./repos/gitlabhq/app/services/repositories
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

# Used for git housek
    
    def execute
      lease_uuid = try_obtain_lease
      raise LeaseTaken unless lease_uuid.present?

      yield if block_given?

      execute_gitlab_shell_gc(lease_uuid)
    end