TIER "Standalone" Shibboleth-IdP

Used for building/running a TIER Shibb-IdP container without the TIER VM or the TIER intermediate docker image.

To use it, see the notes in the following document: https://docs.google.com/document/d/1qb5XTde1nulCdA_8QUei48CxDj0lQs7ShD622Ze_4II/edit?usp=sharing