Use environment.yml to install packages in Dockerfiles

[RobertLucian]

Description

Create the base environment and install the python packages in one go by using an environment.yml config file. For now, this is not advised, because the dev machines don't have enough RAM memory. Once the machines are upgraded, this will possible. Related PR here #880.

name: env
channels:
    - defaults
    - conda-forge
dependencies:
    - conda-forge::python=3.6.9
    - pip
    - pip:
        - --install-option="--no-cache-dir"
        - -r file:lib/requirements.txt
        - -r file:serve/requirements.txt

Motivation

When working with conda environments, it's best to install everything (conda packages & pip packages) in one go to prevent the environment from entering a broken state. The likelihood of the environment to break gets higher the more commands are run one after the another.