Detect the :env from Mix.env

[jeffkreeftmeijer]

Extracted from #86:

Sidenote: Can't we detect the env from Mix.env ? So it's not necessary to set?

In the Ruby integration, we automatically detect the env from Rails, Padrino and Sinatra applications. For Elixir applications, we can default to the Mix.env.

WDYT @thijsc, @tombruijn?

Related: #49.

[arjan]

I've already researched this a few months back, and this is not possible, Mix.env is not available at runtime.

And when compiling a dependent library (like Appsignal itself) from another project, Mix.env is always :prod, so the Appsignal code (e.g. config.ex cannot really use Mix.env at its compiletime to set the default env.

[jeffkreeftmeijer]

Thanks, I'll close this one, then. :)