Possible to force HTTP client Hackney

[ebengt]

Greetings, Would it be possible to add a config to force the existence of Hackney, during compilation?

After I switched Erlang version (might not be connected, but after that it started) in the Dockerfile used to build my application, which include tzdata, the database update does not work in the container. Error message: " missing :hackney dependency..." Hackney is available in the image, but compiled after tzdata.

As a work around I build, delete tzdata and build again. But it would be more obvious with a config or env variable.