Expose GITLAB_FEATURES as CI/CD variable (fixes #40994)

app/models/ci/build.rb

@@ -543,6 +543,7 @@ module Ci
       variables = [
         { key: 'CI', value: 'true', public: true },
         { key: 'GITLAB_CI', value: 'true', public: true },
+        { key: 'GITLAB_FEATURES', value: project.namespace.features.join(','), public: true },
         { key: 'CI_SERVER_NAME', value: 'GitLab', public: true },
         { key: 'CI_SERVER_VERSION', value: Gitlab::VERSION, public: true },
         { key: 'CI_SERVER_REVISION', value: Gitlab::REVISION, public: true },

app/models/namespace.rb

@@ -243,6 +243,10 @@ class Namespace < ActiveRecord::Base
     all_projects.with_storage_feature(:repository).find_each(&:remove_exports)
   end
+  def features
+    []
+  end
+
   private
   def path_or_parent_changed?

changelogs/unreleased/40994-expose-features-as-ci-cd-variable.yml

+---
+title: 'Expose GITLAB_FEATURES as CI/CD variable (fixes #40994)'
+merge_request:
+author:
+type: added

spec/models/ci/build_spec.rb

@@ -1413,6 +1413,7 @@ describe Ci::Build do
       [
         { key: 'CI', value: 'true', public: true },
         { key: 'GITLAB_CI', value: 'true', public: true },
+        { key: 'GITLAB_FEATURES', value: '', public: true },
         { key: 'CI_SERVER_NAME', value: 'GitLab', public: true },
         { key: 'CI_SERVER_VERSION', value: Gitlab::VERSION, public: true },
         { key: 'CI_SERVER_REVISION', value: Gitlab::REVISION, public: true },