Método no definido `sub!' al visitar `/admin/upgrade`

Así es como se instalan los plugins desde app.yml

hooks:
  after_code:
    - exec:
        cd: $home/plugins
        cmd:
          - git clone https://github.com/discourse/docker_manager.git
          - git clone https://github.com/discourse/discourse-solved.git
          - git clone https://github.com/discourse/discourse-chat-integration.git

Había un mkdir plugins adicional como primer comando, por eso existía la carpeta plugins (vacía). Eliminé ese remanente de años anteriores…

La carpeta de los paquetes instalados según el app.yml anterior tiene una carpeta .git dentro.

Volviendo a listar las URLs remotas… como usuario discourse:

discourse@ocean-app:/var/www/discourse/plugins$ for d in *; do echo "$d: $(git -C $d config --get remote.origin.url)"; done
chat:
discourse-chat-integration: https://github.com/discourse/discourse-chat-integration.git
discourse-details:
discourse-lazy-videos:
discourse-local-dates:
discourse-narrative-bot:
discourse-presence:
discourse-solved: https://github.com/discourse/discourse-solved.git
docker_manager: https://github.com/discourse/docker_manager.git
poll:
styleguide:

Como usuario root:

root@ocean-app:/var/www/discourse/plugins# for d in *; do echo "$d: $(git -C $d config --get remote.origin.url)"; done
chat: https://github.com/discourse/discourse.git
discourse-chat-integration:
discourse-details: https://github.com/discourse/discourse.git
discourse-lazy-videos: https://github.com/discourse/discourse.git
discourse-local-dates: https://github.com/discourse/discourse.git
discourse-narrative-bot: https://github.com/discourse/discourse.git
discourse-presence: https://github.com/discourse/discourse.git
discourse-solved:
docker_manager: https://github.com/discourse/docker_manager.git
poll: https://github.com/discourse/discourse.git
styleguide: https://github.com/discourse/discourse.git

Mi suposición: los permisos están totalmente estropeados. ¿Esto parece correcto (dentro del contenedor)?

root@ocean-app:/var/www/discourse# ls -la
total 508
drwxr-xr-x 1 root      root        4096 Aug 10 15:38 .
drwxr-xr-x 1 root      root        4096 Jul 11 00:33 ..
drwxr-xr-x 1 root      root        4096 Jul 11 00:34 app
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 bin
-rw-r--r-- 1 root      root         316 Aug 10 14:36 Brewfile
drwxr-xr-x 1 root      root        4096 Jul 11 00:33 .bundle
drwxr-xr-x 1 root      root        4096 Aug 10 14:47 config
-rw-r--r-- 1 root      root         304 Aug 10 14:36 config.ru
-rw-r--r-- 1 root      root        1303 Aug 10 14:36 CONTRIBUTING.md
-rw-r--r-- 1 root      root        2347 Aug 10 14:36 COPYRIGHT.md
lrwxrwxrwx 1 root      root          10 Aug 10 14:36 d -> bin/docker
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 db
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 .devcontainer
-rw-r--r-- 1 root      root        1315 Aug 10 14:36 discourse.sublime-project
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 docs
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 documentation
-rw-r--r-- 1 root      root         305 Aug 10 14:36 .editorconfig
-rw-r--r-- 1 root      root         334 Aug 10 14:36 .eslintignore
-rw-r--r-- 1 root      root        1061 Aug 10 14:36 .eslintrc
-rw-r--r-- 1 root      root        7146 Aug 10 14:36 Gemfile
-rw-r--r-- 1 root      root       15678 Aug 10 14:36 Gemfile.lock
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 .git
-rw-r--r-- 1 root      root         852 Aug 10 14:36 .gitattributes
-rw-r--r-- 1 root      root        2205 Aug 10 14:36 .git-blame-ignore-revs
-rw-r--r-- 1 root      root         272 Aug 10 15:38 .gitconfig
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 .github
-rw-r--r-- 1 root      root        1282 Aug 10 14:36 .gitignore
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 images
-rw-r--r-- 1 root      root         279 Aug 10 14:36 jsconfig.base.json
-rw-r--r-- 1 root      root         432 Aug 10 14:36 .jsdoc
-rw-r--r-- 1 root      root        1937 Aug 10 14:36 lefthook.yml
drwxr-xr-x 1 root      root       12288 Aug 10 14:36 lib
-rw-r--r-- 1 root      root        1470 Aug 10 14:36 .licensed.yml
-rw-r--r-- 1 root      root         375 Aug 10 14:36 .licensee.json
-rw-r--r-- 1 root      root       18092 Aug 10 14:36 LICENSE.txt
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 log
drwxr-xr-x 1 root      root       20480 Aug 10 14:37 node_modules
-rw-r--r-- 1 root      root          21 Aug 10 14:36 .npmrc
-rw-r--r-- 1 root      root        3114 Aug 10 14:36 package.json
drwxr-xr-x 1 discourse discourse   4096 Aug 16 08:44 plugins
-rw-r--r-- 1 root      root         728 Aug 10 14:36 .prettierignore
-rw-r--r-- 1 root      root         283 Aug 10 14:36 .prettierrc
drwxr-xr-x 1 root      root        4096 Aug 14 00:42 public
-rwxr-xr-x 1 root      root         305 Aug 10 14:36 Rakefile
-rw-r--r-- 1 root      root        6753 Aug 10 14:36 README.md
-rw-r--r-- 1 root      root          25 Aug 10 14:36 .rspec
-rw-r--r-- 1 root      root         246 Aug 10 14:36 .rspec_parallel
-rw-r--r-- 1 root      root         290 Aug 10 14:36 .rubocop.yml
-rw-r--r-- 1 root      root          10 Aug 10 14:36 .ruby-gemset.sample
-rw-r--r-- 1 root      root           6 Aug 10 14:36 .ruby-version.sample
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 script
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 spec
-rw-r--r-- 1 root      root          66 Aug 10 14:36 .streerc
-rw-r--r-- 1 root      root        1054 Aug 10 14:36 .template-lintrc.js
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 test
drwxr-xrwx 1 discourse discourse   4096 Aug 10 15:16 tmp
-rw-r--r-- 1 root      root        2575 Aug 10 14:36 translator.yml
drwxr-xr-x 1 root      root        4096 Jul 11 00:34 vendor
drwxr-xr-x 1 root      root        4096 Aug 10 14:36 .vscode-sample
-rw-r--r-- 1 root      root      204458 Aug 10 14:36 yarn.lock

¿Cuál es la configuración esperada de propiedad/permisos?