La mise à jour de 2.9.0beta1 vers beta4 a échoué

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/web.socketed.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
links:
        - link:
                name: redis
                alias: redis
        - link:
                name: data
                alias: data

params:
  db_default_text_search_config: "pg_catalog.english"
  redis_io_threads: "4" # 1 disables it, n>1 uses extra threads for IO writes

  ## 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: "4096MB"

  ## 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_MAXMIND_LICENSE_KEY: removed
  # 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: 8

  ## TODO: The domain name this Discourse instance will respond to
  ## Required. Discourse will not work with a bare IP number.
  DISCOURSE_HOSTNAME: removed

  ## Uncomment if you want the container to be started with the same
  ## hostname (-h option) as specified above (default "$hostname-$config")
  #DOCKER_USE_HOSTNAME: true

  ## TODO: List of comma delimited emails that will be made admin and developer
  ## on initial signup example 'user1@example.com,user2@example.com'
  DISCOURSE_DEVELOPER_EMAILS: 'removed'

  ## TODO: The SMTP mail server used to validate new accounts and send notifications
  # SMTP ADDRESS, username, and password are required
  # WARNING the char '#' in SMTP password can cause problems!
  DISCOURSE_SMTP_ADDRESS: removed
  DISCOURSE_SMTP_PORT: 587
  DISCOURSE_SMTP_USER_NAME: removed
  DISCOURSE_SMTP_PASSWORD: removed
  #DISCOURSE_SMTP_ENABLE_START_TLS: true           # (optional, default true)
  DISCOURSE_REDIS_HOST: redis

  ## TODO: configure connectivity to the databases
  #DISCOURSE_DB_SOCKET: ''
  DISCOURSE_DB_USERNAME: discourse
  DISCOURSE_DB_PASSWORD: discourse
  DISCOURSE_DB_HOST: data

  ## If you added the Lets Encrypt template, uncomment below to get a free SSL certificate
  LETSENCRYPT_ACCOUNT_EMAIL: removed

  ## The http or https CDN address for this Discourse instance (configured to pull)
  ## see https://meta.discourse.org/t/14857 for details
  #DISCOURSE_CDN_URL: https://discourse-cdn.example.com

## The Docker container is stateless; all data is stored in /shared
volumes:
  - volume:
      host: /var/discourse/shared/standalone
      guest: /shared
  - volume:
      host: /var/discourse/shared/standalone/log/var-log
      guest: /var/log

## Plugins go here
## see https://meta.discourse.org/t/19157 for details
hooks:
  before_code:
    - exec:
        cmd:
          - apt-get update
          - apt-get install -y libsodium-dev
  after_code:
    - exec:
        cd: $home/plugins
        cmd:
          - git clone https://github.com/discourse/docker_manager.git
          - git clone https://github.com/discourse/discourse-chat-integration.git
          - git clone https://github.com/davidtaylorhq/discourse-whos-online.git
          - git clone https://github.com/gdpelican/retort.git
            #- git clone https://github.com/mozilla/discourse-expose-emails-in.git
            #- git clone https://github.com/discourse/discourse-steam-login.git
            #- git clone https://github.com/discourse/discourse-docs.git
          - git clone https://github.com/discourse/discourse-solved.git
          - git clone https://github.com/discourse/discourse-patreon.git
            #- git clone https://github.com/discourse/discourse-encrypt.git
            #- git clone https://github.com/paviliondev/discourse-custom-wizard.git
            #- git clone https://github.com/discourse/discourse-assign.git
            #- git clone https://github.com/discourse/discourse-checklist.git
            #- git clone https://github.com/cpradio/discourse-plugin-vb-emoticons.git
            #- git clone https://github.com/paviliondev/discourse-locations.git
            #- git clone https://github.com/discourse/discourse-bcc.git
            #- git clone https://github.com/discourse/discourse-calendar.git
            #- git clone https://github.com/paviliondev/discourse-layouts.git
            #- git clone https://github.com/barreeeiroo/discourse-discord-sync.git
            #- git clone https://github.com/discourse/discourse-subscriptions
            #- git clone https://github.com/discourse/discourse-oauth2-basic
            #- git clone https://github.com/discourse/discourse-github.git
            #- git clone https://github.com/discourse/discourse-automation.git
            #- git clone https://github.com/communiteq/discourse-rocketchat.git
            #- git clone https://github.com/LibreTranslate/discourse-translator.git

## Any custom commands to run after building
run:
  - exec: echo "Beginning of custom commands"
  ## If you want to set the 'From' email address for your first registration, uncomment and change:
  ## After getting the first signup email, re-comment the line. It only needs to run once.
  #- exec: rails r "SiteSetting.notification_email='info@unconfigured.discourse.org'"
  - exec: echo "End of custom commands"