Update Dockerfile

# Docker Image for running csg-eb tests

FROM python:3.8.6

FROM python:3.8.7

MAINTAINER Mark Meredith <mark.meredith@netl.doe.gov>

LABEL maintainer="Mark Meredith <mark.meredith@netl.doe.gov>"

RUN wget https://bootstrap.pypa.io/get-pip.py

RUN python3 get-pip.py

RUN python3 -m pip install cmake conan ninja

RUN pip install cmake==3.18.4 conan==1.32.1 ninja==1.10.0.post2

CMD [ "/bin/bash" ]