Need setup_conda.sh to handle user-maintained conda environment

[mkavulich]

Description

Currently, setup_conda.sh will always download a brand new conda build under the dtc-vx-workflow/conda directory. This can cause complications for users who have their own conda build and managed environments

Solution

Add logic in setup_conda.sh that allows users to install the vx_workflow conda environment in their own managed conda setup

Requirements

Add logic in setup_conda.sh that allows users to install the vx_workflow conda environment in their own managed conda setup

[mkavulich]

Resolved via #25