[DRE-maint] Bug#956604: ruby-jquery-rails autopkgtest fails with Sprockets::FileNotFound: couldn't find file 'jquery' with type 'application/javascript'

[Pirate Praveen]

Package: ruby-jquery-rails
Version: 4.3.3-1
Severity: serious

autopkgtest is failing with

+ bundle exec rake assets:precompile
/usr/share/rubygems-integration/all/gems/actionpack-5.2.4.1/lib/action_dispatch/middleware/stack.rb:37: 
warning: Using the last argument as keyword parameters is deprecated; 
maybe ** should be added to the call
/usr/share/rubygems-integration/all/gems/actionpack-5.2.4.1/lib/action_dispatch/middleware/static.rb:111: 
warning: The called method `initialize' is defined here
Yarn executable was not detected in the system.
Download Yarn at https://yarnpkg.com/en/docs/install
rake aborted!
Sprockets::FileNotFound: couldn't find file 'jquery' with type 
'application/javascript'
Checked in these paths:
  
/tmp/autopkgtest-lxc.md2q522o/downtmp/autopkgtest_tmp/foo/app/assets/config
  
/tmp/autopkgtest-lxc.md2q522o/downtmp/autopkgtest_tmp/foo/app/assets/images
  
/tmp/autopkgtest-lxc.md2q522o/downtmp/autopkgtest_tmp/foo/app/assets/javascripts
  
/tmp/autopkgtest-lxc.md2q522o/downtmp/autopkgtest_tmp/foo/app/assets/stylesheets
  /usr/share/ruby-coffee-rails/lib/assets/javascripts
  
/usr/share/rubygems-integration/all/gems/actioncable-5.2.4.1/lib/assets/compiled
  
/usr/share/rubygems-integration/all/gems/activestorage-5.2.4.1/app/assets/javascripts
  
/usr/share/rubygems-integration/all/gems/actionview-5.2.4.1/lib/assets/compiled
  
/usr/share/rubygems-integration/all/gems/turbolinks-source-5.1.0/lib/assets/javascripts
  /tmp/autopkgtest-lxc.md2q522o/downtmp/autopkgtest_tmp/foo/node_modules