Add a memory limit to Docker containers

Description

Adds a memory limit 4 GiB to Docker containers.

Changes

N/A

Additions

• Allocate at most 4 GiB of RAM (including swap) to a Docker container
• Set the name of the docker image to the submission ID for easier identification

Test and Review

To be filled in by the reviewers

• All of the methods are commented to expectation

• The methods are tested to satisfaction

• There are no unnecessary files present in the MR

• The continuous integration has no problems with the MR

• The MR is filled in as requested (including labels, milestones, and reviewers)

• The documentation is up-to-date

• All nullable parameters are marked as such