You may reproduce by creating a new box with Forklift (vagrant up centos7-katello-nightly).

Check out the attached screenshot, but basically without JS users can't even click on the vertical navigation bar.

As you can see, assets:precompile and webpack:compile don't work after installation.

vssh centos7-katello-nightly
Last login: Tue May 29 08:05:47 2018 from 192.168.121.1
[vagrant@centos7-katello-nightly ~]$ sudo foreman-rake assets:precompile
/usr/share/foreman/lib/foreman.rb:8: warning: already initialized constant Foreman::UUID_REGEXP
/usr/share/foreman/lib/foreman.rb:8: warning: previous definition of UUID_REGEXP was here
/usr/share/foreman/lib/core_extensions.rb:182: warning: already initialized constant ActiveSupport::MessageEncryptor::DEFAULT_CIPHER
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.4/lib/active_support/message_encryptor.rb:22: warning: previous definition of DEFAULT_CIPHER was here
rake aborted!
LoadError: cannot load such file -- sass
/opt/theforeman/tfm/root/usr/share/gems/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `block in require'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/autoload/sass.rb:1:in `<top (required)>'
/opt/theforeman/tfm/root/usr/share/gems/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `block in require'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:292:in `require'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/sass_processor.rb:47:in `initialize'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/sass_processor.rb:26:in `new'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/sass_processor.rb:26:in `instance'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/sass_processor.rb:30:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:75:in `call_processor'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `call_processors'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/loader.rb:60:in `block in load'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/loader.rb:44:in `load'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:47:in `load'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/bundle.rb:23:in `block in call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/utils.rb:200:in `dfs'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/bundle.rb:24:in `call'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:75:in `call_processor'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `call_processors'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/loader.rb:60:in `block in load'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/loader.rb:44:in `load'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:47:in `load'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/base.rb:66:in `find_asset'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/base.rb:73:in `find_all_linked_assets'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:134:in `block in find'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:133:in `each'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:133:in `find'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:185:in `compile'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-3.7.1/lib/rake/sprocketstask.rb:147:in `with_logger'
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
/opt/rh/rh-ruby24/root/usr/share/gems/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
Tasks: TOP => assets:precompile
(See full trace by running task with --trace)
[vagrant@centos7-katello-nightly ~]$ sudo foreman-rake webpack:compile
/usr/share/foreman/lib/foreman.rb:8: warning: already initialized constant Foreman::UUID_REGEXP
/usr/share/foreman/lib/foreman.rb:8: warning: previous definition of UUID_REGEXP was here
/usr/share/foreman/lib/core_extensions.rb:182: warning: already initialized constant ActiveSupport::MessageEncryptor::DEFAULT_CIPHER
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/activesupport-5.1.4/lib/active_support/message_encryptor.rb:22: warning: previous definition of DEFAULT_CIPHER was here
rake aborted!
Can't find our webpack executable at /usr/share/foreman/node_modules/.bin/webpack - have you run `npm install`?
/opt/theforeman/tfm/root/usr/share/gems/gems/webpack-rails-0.9.8/lib/tasks/webpack.rake:10:in `block (2 levels) in <top (required)>'
/opt/rh/rh-ruby24/root/usr/share/gems/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
Tasks: TOP => webpack:compile
(See full trace by running task with --trace)