feat(admin): ability to specify testing environment

[CaerusKaru]

This issue is here to allow for discussion on how upload testing should be handled.

• needs to be easy for instructors to add testing options
• needs to be secure
• needs to work
• current impl (provide) allows for a script to be passed in, maybe allow upload of one (or more) test scripts?
• this is mostly a backend issue, but how the instructors interact with this part of the service is critical

[CaerusKaru]

The current latest thinking is that we will have Docker containers with several unique setups, and allow for instructors to upload a zip file with an entry script and support scripts which will look for a folder labeled submission.

The design for this will be an interactive(?) terminal that can process a sample submission after the zip file has been uploaded.

Question: how to allow for testing one submission on everyone else's submissions? Will need backend design