PYTHIA6 (pythiaeRHIC) Support in ePIC Containers

**Is your feature request related to a problem? Please describe.**
Currently, the generation of PYTHIA6 events using the pythiaeRHIC MCEG (used for example for minBias samples for low Q2 and background studies) requires code and an environment maintained at BNL. It would be good for reproducibility sake to be able to run this more readily from the ePIC environment.

**Describe the solution you'd like**
One should be able to run pythiaeRHIC and read and manipulate (convert to HepMC for example) the resulting text files / root trees using the ePIC environment, independent of having access to the BNL EIC computing environment.

**Describe alternatives you've considered**
Maybe pythiaeRHIC could be maintained as a separate container instead of within the ePIC containers?

**Additional context**
This must be an issue for other MCEGs used by ePIC. It is certainly not practical to include all MCEGs in the ePIC container, but how do we both keep track/vet what is being generated as official ePIC simulation and ensure the generators are available to all?