instance method private_url

# File activestorage/lib/active_storage/service/gcs_service.rb, line 148
      def private_url(key, expires_in:, filename:, content_type:, disposition:, **)
        args = {
          expires: expires_in,
          query: {
            "response-content-disposition" => content_disposition_with(type: disposition, filename: filename),
            "response-content-type" => content_type
          }
        }

        if @config[:iam]
          args[:issuer] = issuer
          args[:signer] = signer
        end

        file_for(key).signed_url(**args)
      end