Add rake task for update Platform6
user
```ruby
namespace :platform6 do
  desc "Update Platform6 stuff"
  task :update => :environment do
    require 'rpm'
    require 'open-uri'

    branch = Branch.where(:name => 'Platform6', :vendor => 'ALT Linux').first

    ActiveRecord::Base.transaction do
      puts "#{Time.now.to_s}: Update Platform6 stuff"
      puts "#{Time.now.to_s}: update *.src.rpm from Platform6 to database"
      path = '/ALT/p6/files/SRPMS/*.src.rpm'
      Dir.glob(path).each do |file|
        begin
          if !$redis.exists branch.name + ":" + file.split('/')[-1]
            puts "#{Time.now.to_s}: updating '#{file.split('/')[-1]}'"
            Srpm.import_srpm(branch.vendor, branch.name, file)
          end
        rescue RuntimeError
          puts "Bad .src.rpm: #{file}"
        end
      end

      Srpm.remove_old_srpms('ALT Linux', 'Platform6', '/ALT/p6/files/SRPMS/')
    end

    puts "#{Time.now.to_s}: expire cache"
    ['en', 'ru', 'uk', 'br'].each do |locale|
      ActionController::Base.new.expire_fragment("#{locale}_srpms_#{branch.name}_")
    end

    puts "#{Time.now.to_s}: end"
  end
end
```
assistant