activate conda environment

I need to do this to avoid #241

see https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html#activating-an-environment

Conda environments need to be activated for them to work properly. Currently I simply just use the executable at the targed python path.

If you have ran into a conda issue please comment below to let me know I should work on this.