I've definitely run into issues where I need to pass an environment
variable at run time, but an application that I use doesn't support the
{:system, "DATABASE_URL"} or {:system, "PORT"} style environment variables
that Ecto and Phoenix support.
I'm curious if it would be beneficial to add support in
Application.get_env/2 that when the value that returns matches {:system,
var} then System.get_env(var) would be called under the hood.
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