Download agent in dynamic tmp path (#231)
Download agent in dynamic tmp path (#231)

This to fix potential issues with the tmp dir not existing, such as on
Microsoft Windows, but also on machines where the tmp dir is not
writable.

Hopefully this fixes a potential permission issues as described in #213.
appsignal/appsignal-elixir,appsignal/appsignal-elixir,appsignal/appsignal-elixir,appsignal/appsignal-elixir