Adds CONFIG_USER Filter

[abonnell]

Context

Implements a CONFIG_USER Filter that users can hook into and replace key values in their config.yml files

Similar in usage to the CONFIG_UNIQUE filter but it will always replace the value of a given key with the new value being passed in instead of skipping over it

Example usage in a tutor plugin, being used to fetch secrets from AWS Secrets Manager and put that dictionary of key:value pairs into config.yml to be ingested by tutor patches

@hooks.Filters.CONFIG_USER.add()
def fetch_secrets_from_aws(config):
    secrets = s.do_config()

    for secret in secrets:
        config.append(
            (secret, secrets[secret])
        )
        
    return config

[regisb]

thanks for rising up to the challenge! I just have a couple minor comments. Did you try out this change and verify that it works for your use case?

[abonnell]

thanks for rising up to the challenge! I just have a couple minor comments. Did you try out this change and verify that it works for your use case?

Yes! Its working pretty cleanly, no real issues with it within the scope of what its trying to do!

[abonnell]

@regisb have you had a chance to review after my changes? Thanks! Apologies if I made changes for the review incorrectly, my org doesn't use github and I'm not super familiar with its review process

[DawoudSheraz]

@abonnell Hi. I will add a review on Monday. It has been on my todo, but did not get time to look at it. Apologies for the delay. Thanks

[abonnell]

Updated changelog, hook decription, provided clarity to dawoud

[DawoudSheraz]

nit: Useful for injecting secrets from an external secrets manager into edx, or other values that may change over time that you need to programmatically fetch --> The filter can be used for injecting secrets from an external secrets manager into Open edX deployment, or other values that may change over time and need to be fetched programmatically

[abonnell]

Apologies @DawoudSheraz , missed a formatting change. Double checked make test and it seems good now

[regisb]

lgtm!