Something like this? You can upgrade some versions (elixir, erlang, the elixir ideal plugin) in the dockerfile, I have not worked on the project for 7 mths.

I’m not aware of any, but cloud9, but I have never tested or used it.

If I recall correctly:

• Add/set up a Workspace
• Whilst defining the workspace you can select a stack

I chose a single machine (Ubuntu) and then once running used the terminal to configure it to my needs. As I mentioned previously, set up can be a little slow and I am not certain if this is a limitation of the free account, or not.

There are some quick-start options that may give you a better start and save the hassle of having to configure your environment, but I have not looked at those.

Hope that helps