Directory of reproducible conda envs for various systems

Aris has started experimenting on Summit and hit a few issues. So let's start recording our conda envs so that we can keep working envs available on most of the systems we use. This should go in a new subdirectory where we can add various environment definition yaml files.

Plan

Let's create an envs/ subdirectory that holds a few conda environment definitions:

• environment.summit.yml: an env that works with opence on summit
• environment.lucky.yml: an env for lucky that we should also use in our CI tests, if possible. That way we know it won't get out of date.