Add a CI_PROJECT_ROOT_NAMESPACE_ID pre-defined CI/CD variable

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Problem to solve

At least one GitLab API resource only accepts group IDs as input (not group path, only group ID). Particularly, I'm referring to the Users API for creating a group runner, but there might be more like this.

I'm automating self-hosted group runner creation in CI/CD, for which I need the group ID of the root namespace of the project where the automation runs. Right now, I only have the path, via the CI_PROJECT_ROOT_NAMESPACE variable, but I need the ID. As a workaround, I've simply added the ID as a CI/CD variable in the root namespace, but it'd be neat if it were pre-defined.

Proposal

My proposal is pretty simple, I'd say: add a CI_PROJECT_ROOT_NAMESPACE_ID variable to the list of pre-defined CI/CD variables, with the ID of the root namespace.

Intended users

I'd say:

• Priyanka (Platform Engineer)
• Ingrid (Infrastructure Operator)
• Isaac (Infrastructure Engineer)

(This is my first feature proposal here and my first time seeing this, so apologies if I did it wrong.)

Feature Usage Metrics

I don't know, but I can infer it'll be the same way you track the usage of the CI_PROJECT_ROOT_NAMESPACE variable, if any.

Does this feature require an audit event?

I don't... think so?