Add '/data/submission' and '/data/feedback' folders to the volume during init phase of the job

We should not delegate the creation of the /data/feedback folder to the grading image

added bug ~3048 labels

assigned to @remmal

By fixing this, we will be able to add in the specification that the grading image can assume the presence of both /data/submission and /data/feedback

One question that I have is : Should we provide metadata about the submission to the grading image ? If so, we have two possibilities:

• Via System variables: easy to implement but it adds a lot of information at the system level of the containers.
• Via a json file in /data/submission/metadata.json: More secure and we delegate the management to the grading image. Each teacher is responsible of how they process the data

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In the second case, we should probably change the contract to provide the submission material under a different path such as /data/submission/material

changed the description

added prio:high label

assigned to @morawiec and unassigned @remmal

mentioned in merge request !219 (merged)

closed with merge request !219 (merged)