Using ember within Docker install

[fefrei (Felix Freiberger)]

…and I just realized that this is a duplicate of:

Ember CLI - How do I use it in discourse?

Hello, I am about to start hacking away at discourse, but I am confused how ember is used. Running commands such as ‘ember version’ or 'ember g ’ give the error ‘ember: No such file or directory’. Do I need to install the ember cli separately?