Add support for Docker

This is a project idea for Google Summer of Code (GSOC).

To discuss this or other ideas with your potential mentor from the Apache ManifoldCF project, sign up and post to the dev@manifoldcf.apache.org list, including "[GSOC]" in the subject. You may also comment on this Jira issue if you have created an account. 

We would like to adopt Docker to provide ready to use images with preconfigured architecture stack for ManifoldCF. This will include ManifoldCF itself but also the related database that can be MySQL, PostgreSQL and so on.

This will help developers to work and put in production a complete ManifoldCF installation.

You will be involved in the development of the following tasks, you will learn how to:

• Write Docker files
• Write Docker Compose files
• Implement unit tests
• Build all the integration tests
• Write the documentation for new component

We have a complete documentation about ManifioldCF:

https://manifoldcf.apache.org/release/release-2.9.1/en_US/concepts.html

Take a look at our book to understand better the framework and how to extend it in different ways:

https://github.com/DaddyWri/manifoldcfinaction/tree/master/pdfs

Prospective GSOC mentor: piergiorgio@apache.org