فشل apt-get update داخل مستودع yarn للحاوية غير موقع

Here it is:

 GNU nano 2.9.3                                                                         containers/app.yml                                                                                   
 
 
 ## this is the all-in-one, standalone Discourse Docker container template
 ##
 ## After making changes to this file, you MUST rebuild
 ## /var/discourse/launcher rebuild app
 ##
 ## BE *VERY* CAREFUL WHEN EDITING!
 ## YAML FILES ARE SUPER SUPER SENSITIVE TO MISTAKES IN WHITESPACE OR ALIGNMENT!
 ## visit http://www.yamllint.com/ to validate this file as needed
 
 templates:
  - "templates/postgres.template.yml"
  - "templates/redis.template.yml"
  - "templates/web.template.yml"
  - "templates/web.ratelimited.template.yml"
 ## Uncomment these two lines if you wish to add Lets Encrypt (https)
  - "templates/web.ssl.template.yml"
  - "templates/web.letsencrypt.ssl.template.yml"
  - "templates/import/mbox.template.yml"
 ## which TCP/IP ports should this container expose?
 ## If you want Discourse to share a port with another webserver like Apache or nginx,
 ## see https://meta.discourse.org/t/17247 for details
 expose:
  - "80:80"   # http
  - "443:443" # https
 
 params:
  db_default_text_search_config: "pg_catalog.english"
 
  ## Set db_shared_buffers to a max of 25% of the total memory.
  ## will be set automatically by bootstrap based on detected RAM, or you can override
  db_shared_buffers: "1024MB"
 
  ## can improve sorting performance, but adds memory usage per-connection
  #db_work_mem: "40MB"
 
  ## Which Git revision should this container use? (default: tests-passed)
  #version: tests-passed
 
 env:
  LANG: en_US.UTF-8
  # DISCOURSE_DEFAULT_LOCALE: en
 
  ## How many concurrent web requests are supported? Depends on memory and CPU cores.
  ## will be set automatically by bootstrap based on detected CPUs, or you can override
  UNICORN_WORKERS: 4