Setup docker file + GitLab Pipelines

Setup a docker file that will install CPLEX and Java and then run the executable against a series of unit tests to ensure it can find the proper keys.

Useful Links:

CPLEX Specific Links:

• https://github.com/cdiener/cobra-docker/issues/2
• https://www.ibm.com/support/knowledgecenter/SSSA5P_12.7.0/ilog.odms.studio.help/Optimization_Studio/topics/td_silent_install.html
• https://github.com/victorskl/docker-cplex

Generic Docker Links:

• https://docs.docker.com/develop/develop-images/baseimages/
• https://www.howtoforge.com/tutorial/how-to-create-docker-images-with-dockerfile/