How to set environment variables?

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Hi,

My app won't start without specific environment variables, which I think severely affects the autocompletion feature.

For example I can see this in the debug output:

16:12:23.046 [error] Process #PID<0.124.0> raised an exception
** (Mix.Error) Can't continue due to errors on dependencies
    (mix 1.14.1) lib/mix.ex:513: Mix.raise/2
    (mix 1.14.1) lib/mix/tasks/deps.loadpaths.ex:43: Mix.Tasks.Deps.Loadpaths.run/1
    (mix 1.14.1) lib/mix/task.ex:421: anonymous fn/3 in Mix.Task.run_task/4
    (mix 1.14.1) lib/mix/tasks/loadpaths.ex:41: Mix.Tasks.Loadpaths.run/1
    (mix 1.14.1) lib/mix/task.ex:421: anonymous fn/3 in Mix.Task.run_task/4
    (mix 1.14.1) lib/mix/tasks/compile.ex:127: Mix.Tasks.Compile.run/1
    (mix 1.14.1) lib/mix/task.ex:421: anonymous fn/3 in Mix.Task.run_task/4
    (mix 1.14.1) lib/mix/task.ex:475: Mix.Task.run_alias/6

For the development flow, I put those variables in my script autoload file ( ~/.config/fish/config.fish). Is there a way to do something similar for ElixirLS in Nova?