Ember

Describe the bug
When running yarn build and pressing enter, it states the following error:

It would be nice if the tool did not allow empty selections.

To Reproduce

• Run yarn build
• Press enter

System
Please paste the results of npx sb@next info here

Issue Summary

KBD macro doesn't look correct with inverse colors (dark mode)

To Reproduce

1. Switch to dark mode in admin
2. Add MD snippet with tag
3. Here's how it looks like
   

Technical details:

• Ghost Version: irrelevant for CSS issue
• Node Versio

By default ember-cli updates a number of the "app trees" to be from tests/dummy when developing an addon locally. We do this for app, styles, templates, public, and tests trees (handled inside lib/broccoli/ember-addon.js).

Unfortunately, we do not forward the apps vendor tree to tests/dummy/. This means that our addon's treeForVendor is called, but then subsequently clobbered by the "apps

Relevant conversation here: hjdivad/ember-m3#807

Breaking docs app is way too easy. See #1700 as a recent example. I think we should add some basic regressions tests. Most of the issues we have seen in the past would have be caught by a test, which simply tries to build the docs app. Maybe running yarn docs:build in CI is good enough as a starter.