Building new rails app with --css=bootstrap fails

[NielsKSchjoedt]

Running: rails-new --rails-version=8.0.0.beta1 my_app --edge --devcontainer --database=postgresql --css=bootstrap with the latest raises an error in the installation flow:
(using the latest: https://github.com/rails/rails-new/releases/tag/v0.4.1)

(...)
    Add bin/dev to start foreman
       force      bin/dev
  Install Bootstrap with Bootstrap Icons, Popperjs/core and Autoprefixer
      create    app/assets/stylesheets/application.bootstrap.scss
         run    yarn add sass bootstrap bootstrap-icons @popperjs/core postcss postcss-cli autoprefixer nodemon from "."
      insert    config/initializers/assets.rb
  Appending Bootstrap JavaScript import to default entry point
      append    app/javascript/application.js
  Pin Bootstrap
      append    config/importmap.rb
      insert    config/initializers/assets.rb
      append    config/initializers/assets.rb
bin/rails aborted!
Rails::Generators::Error: The template [/usr/local/bundle/gems/cssbundling-rails-1.4.1/lib/install/bootstrap/install.rb] could not be loaded. Error: No such file or directory - npx (Rails::Generators::Error)


Caused by:
Errno::ENOENT: No such file or directory - npx (Errno::ENOENT)

Tasks: TOP => app:template
(See full trace by running task with --trace)
         run  bundle binstubs kamal
         run  bundle exec kamal init
Created configuration file in config/deploy.yml
Created .kamal/secrets file
Created sample hooks in .kamal/hooks
       force  .kamal/secrets
       force  config/deploy.yml
       rails  solid_cache:install solid_queue:install solid_cable:install
      create  config/cache.yml
      create  db/cache_schema.rb
        gsub  config/environments/production.rb
      create  config/queue.yml
      create  config/recurring.yml
      create  db/queue_schema.rb
      create  bin/jobs
        gsub  config/environments/production.rb
      create  db/cable_schema.rb
       force  config/cable.yml

What's up here and how do I resolve it?

[NielsKSchjoedt]

Seems to be the same as: rails/rails-new#31