Add docker resource limits for jobs

[evanyeyeye]

Adds the following resource limits to new jobs:

• Number of CPU cores
• Memory (in MB)

Addresses: @139

Resource limits can be verified using docker stats and htop.

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Commits

Files that changed from the base of the PR and between 61cd508 and 1dc4112.

Walkthrough

The recent updates involve enhancing resource management for Docker containers in an autograding system. The changes allow for dynamic allocation of CPU cores and memory limits based on configurations or job-specific requirements. This is achieved by modifying method signatures to accept resource parameters and updating the logic to apply these constraints when creating and running Docker containers.

Changes

File Path	Change Summary
restful_tango/tangoREST.py	Modified createTangoMachine method to handle vmObj as an optional parameter and set cores and memory based on the vmObj if provided. Also retrieves cores and memory limits from the Config module.
vmms/localDocker.py	Appended CPU and memory constraints to the args list used for running a Docker container in the runJob method.
config.template.py	Added declarations for Docker autograding container resource limits (DOCKER_CORES_LIMIT and DOCKER_MEMORY_LIMIT) within the Config class.

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[damianhxy]

Verified that limits are set (1GB memory, 1 CPU):

(Ref https://phoenixnap.com/kb/docker-memory-and-cpu-limit)

However, need to avoid breaking existing installations -- see comment about getattr

[damianhxy]

Verified that autograding works when Config.py is outdated

LGTM