Pulp

This would add a build+test+publish of core images to the PyPI test+publish pipeline that is triggered from a new tag being added to the repo.

So today it when that pipeline triggers it:
1. pulp-smash the code and if it passes
2. publish the code to PyPI

This would update that pipeline to instead build a container based on the centos7-python36 vanilla container.

1. pulp-smash the code and if it passes
2. build a container on top of centos7-python36 container that contains pulpcore and pulpcore-plugin
3. pulp-smash ^ container and if it passes
4. publish the code to PyPI
5. publish the container to quay.io