Add environment variables to environment.yml files

[AlbertDeFusco]

This PR enables creation and export of conda environments that have environment variable created with conda env config vars.

Tests have been included for this behavior.

Here' an example

Create and export

First create a new env and set two variables and confirm

> conda create -y -n env_with_vars python=3.7
> conda env config vars set DUDE=woah SWEET=yaaa -n env_with_vars
> conda run -n env_with_vars env | grep -E "DUDE|SWEET"
DUDE=woah
SWEET=yaaa

When the env is exported the variables are retained in a key called variables:

> conda env export -n env_with_vars --from-history
name: env_with_vars
channels:
  - defaults
dependencies:
  - python=3.7
variables:
  DUDE: woah
  SWEET: yaaa
prefix: /Users/adefusco/Development/Conda/conda/devenv/envs/env_with_vars

And also with the full dependency spec

> name: env_with_vars
channels:
  - defaults
dependencies:
  - ca-certificates=2020.6.24=0
  - certifi=2020.6.20=py37_0
  - libcxx=10.0.0=1
  - libedit=3.1.20191231=h1de35cc_1
  - libffi=3.3=hb1e8313_2
  - ncurses=6.2=h0a44026_1
  - openssl=1.1.1g=h1de35cc_0
  - pip=20.2.2=py37_0
  - python=3.7.7=hf48f09d_4
  - readline=8.0=h1de35cc_0
  - setuptools=49.6.0=py37_0
  - sqlite=3.32.3=hffcf06c_0
  - tk=8.6.10=hb0a8c7a_0
  - wheel=0.34.2=py37_0
  - xz=5.2.5=h1de35cc_0
  - zlib=1.2.11=h1de35cc_3
variables:
  DUDE: woah
  SWEET: yaaa
prefix: /Users/adefusco/Development/Conda/conda/devenv/envs/env_with_vars

Create from yaml

The environment.yml spec will allow variables to be set when the env is created.

# environment.yml
name: new_env
dependencies:
  - python=3.8
variables:
  DUDE: woah
  SWEET: yaaa

Confirm that the variables have been set.

> conda env create -f environment.yml
> conda run -n new_env env | grep -E "DUDE|SWEET"
DUDE=woah
SWEET=yaaa

[chenghlee]

Closing & re-opening this PR to trigger new CI checks.

[chenghlee]

LGTM

[Florents-Tselai]

What happens when you don't want to store certain ENV_VARS in Git or want to separate between dev and production. Is there any recipe for an "if not already defined use this" implementation?

In prod for example these can be injected via systemd, but in dev, they should be there

[AlbertDeFusco]

This is a very good point and perhaps anaconda-project can help. I'd like to continue to this discussion.

https://anaconda-project.readthedocs.io/en/latest/user-guide/tasks/work-with-variables.html

This recent PR defines env var priority ordering in anaconda-project and will be part of the next release

anaconda/anaconda-project#286

[github-actions]

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