Allow adjusting the default process_mode for resource_groups - API only

Release notes

Problem to solve

The CI/CD resource_group feature always defaults to the unordered process mode for new resource groups.

For teams that uses one of the other process modes within their projects, they always need to use the API call to edit the process_mode attribute after new resource groups are created to change the mode value (i.e. oldest_first, newest_first).

Proposal

As a first iteration, we should have an API to set the default process mode at the project level for newly created resource groups.

1. Add a resource_group_default_process_mode column to the projects table
   • the default value is null
   • the allowed values are unordered | oldest_first | newest_first - the same as the ResourceGroup.process_mode
2. Update the Edit Project API to support updating of the resource_group_default_process_mode
   • Projects API file: https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/projects.rb#L556
   • Projects API optional parameters: https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/api/helpers/projects_helpers.rb#L11
3. In the CI pipeline chain, update resource group creation to copy the project.resource_group_default_process_mode if it is not yet set
   • resource group creation step: Gitlab::Ci::Pipeline::Chain::EnsureResourceGroups
   • this is called in the Ci::CreatePipelineService

Intended users

Project Owners / Maintainers

Feature Usage Metrics