Add backup logger class

Added backup class to output on stdout and generate a log file

Changelog: added

lib/gitlab/backup_logger.rb

+# frozen_string_literal: true
+
+module Gitlab
+  class BackupLogger < Gitlab::JsonLogger
+    def self.file_name_noext
+      'backup_json'
+    end
+  end
+end

lib/tasks/gitlab/backup.rake

@@ -282,6 +282,7 @@ namespace :gitlab do
 
     def puts_time(msg)
       progress.puts "#{Time.now} -- #{msg}"
+      Gitlab::BackupLogger.info(message: "#{Rainbow.uncolor(msg)}")
     end
 
     def progress

spec/tasks/gitlab/backup_rake_spec.rb

@@ -209,6 +209,23 @@ RSpec.describe 'gitlab:app namespace rake task', :delete do
             expect { run_rake_task("gitlab:backup:#{task}:create") }.to output(/Dumping /).to_stdout_from_any_process
           end
         end
+
+        it 'logs the progress to log file' do
+          expect(Gitlab::BackupLogger).to receive(:info).with(message: "Dumping database ... ")
+          expect(Gitlab::BackupLogger).to receive(:info).with(message: "[SKIPPED]")
+          expect(Gitlab::BackupLogger).to receive(:info).with(message: "Dumping repositories ...")
+          expect(Gitlab::BackupLogger).to receive(:info).with(message: "Dumping uploads ... ")
+          expect(Gitlab::BackupLogger).to receive(:info).with(message: "Dumping builds ... ")
+          expect(Gitlab::BackupLogger).to receive(:info).with(message: "Dumping artifacts ... ")
+          expect(Gitlab::BackupLogger).to receive(:info).with(message: "Dumping pages ... ")
+          expect(Gitlab::BackupLogger).to receive(:info).with(message: "Dumping lfs objects ... ")
+          expect(Gitlab::BackupLogger).to receive(:info).with(message: "Dumping container registry images ... ")
+          expect(Gitlab::BackupLogger).to receive(:info).with(message: "done").exactly(7).times
+
+          task_list.each do |task|
+            run_rake_task("gitlab:backup:#{task}:create")
+          end
+        end
       end
     end