Add full support for environment variable expansion in environment.kubernetes.flux_resource_path

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Problem to solve

Currently, the environment:kubernetes:flux_resource_path attribute has no variable expansion capabilities compared to environment:kubernetes:agent and environment:url. This inconsistency may lead to confusion for users and limit the flexibility of namespace configuration in GitLab CI/CD.

Intended users

GitLab users who use Kubernetes integrations in their CI/CD pipelines, especially those who need dynamic namespace configuration.

Further details

As noted in MR !178171 (closed), the environment:kubernetes:agent attribute offers full variable expansion similar to environment:url, while environment:kubernetes:flux_resource_path has no expansion capabilities.

Proposal

Update the environment:kubernetes:flux_resource_path attribute to support full variable expansion, consistent with environment:kubernetes:agent and environment:url. This would include support for:

• All variables defined for a job (project/group variables, variables from .gitlab-ci.yml, variables from triggers, variables from pipeline schedules)
• CI_ENVIRONMENT_* variables
• Persisted variables

What does success look like, and how can we measure that?

Success would be achieved when:

1. The environment:kubernetes:flux_resource_path attribute supports the same level of variable expansion as environment:kubernetes:agent and environment:url.
2. Documentation is updated to reflect this change.
3. Users can utilize a wider range of variables when defining Kubernetes namespaces in their CI/CD configurations.

Links / references

• Related MR: !178171 (closed)
• Current documentation: Where variables can be used

Implementation Guide

The Flux resource path is set in UpdateEnvironmentsService. #flux_resource_path can be renamed to #expanded_flux_resource_path, using the same expansion logic used in #expanded_environment_url and #expanded_cluster_agent_path (also in this class).