Invoke rake task in the (app? sidekick?) docker container to load ETD

[kerchner]

This is a first step and likely a temporary one. Ultimately this app is likely to be rewritten to create Bulkrax zip files (also with possible Ruby rewrite as per work started on the ruby-refactor branch).

Work for this ticket is to:

• Rewrite the --import command so that instead of constructing and calling a rake command for each ETD, it constructs and calls commands to:
  • docker cp files for each ETD into the container (for example, to /opt/scholarspace/scholarspace-tmp or as configured)
  • docker exec to invoke the existing rake command inside the container to import this ETD
  • Remove the ETD files within the container

There should also be a way to monitor for success/failure of each upload as it occurs within the container, with log and/or stdout/stderr messages.

The role of sidekiq in this process should also be clarified. If we invoke the rake task in the app container, does the app send these jobs to the sidekiq queue? And/or should the rake task be called in the sidekiq container? Work on this ticket should clarify these questions -- but ultimately we will likely want this app to create a Bulkrax zip and load it through the Bulkrax API/CLI