Cannot install new plugins: structure needs cleaning

Installation
4

Hi, I followed this procedure.

The plugin part of the containers/app.yml:

## Plugins go here
## see https://meta.discourse.org/t/19157 for details
hooks:
  after_code:
- exec:
    cd: $home/plugins
    cmd:
      - git clone https://github.com/discourse/docker_manager.git
      - git clone https://github.com/paviliondev/discourse-locations.git
      - git clone https://github.com/discourse/discourse-sitemap.git
#          - git clone https://github.com/discourse/discourse-reactions.git
      - git clone https://github.com/discourse/discourse-translator.git

Tried it again just now, same cycle of output repeating over and over.