Support multiple environment variables in `run_container` for Docker

[tristan-f-r]

(I was about to create a horrible way of passing information for gurobi secrets with respect to NetMix2 because I forgot about environment variables).

Gurobi has three environment secrets:

WLSACCESSID
WLSSECRET
LICENSEID

Right now, run_container for Docker only allows passing one of them - this should be changed to a dictionary of key value pairs for environment variables.

I would like to finish this after #220 is merged since #220 already (slightly) conflicts with #226.

[tristan-f-r]

This also will resolve the following comment

spras/spras/analysis/cytoscape.py

Line 30 in 215de99

# Requires generalizing the run_container function to support multiple environment variables