Add support for CI_COMMIT_REF_NAME variable in includes

doc/ci/yaml/index.md

@@ -426,6 +426,8 @@ In `include` sections in your `.gitlab-ci.yml` file, you can use:
 - Project [predefined variables](../variables/predefined_variables.md).
 - [Custom instance, group, and project variables](../variables/index.md#custom-cicd-variables)
   in GitLab 14.2 and later.
+- `$CI_COMMIT_REF_NAME` [predefined variable](../variables/predefined_variables.md) in GitLab 14.2
+  and later.
 
 ```yaml
 include:

lib/gitlab/ci/config.rb

@@ -121,17 +121,26 @@ module Gitlab
         Gitlab::Ci::Variables::Collection.new.tap do |variables|
           break variables unless project
 
-          # The order of the next 4 lines is important as priority of CI variables is
+          # The order of the following lines is important as priority of CI variables is
           # defined globally within GitLab.
           #
           # See more detail in the docs: https://docs.gitlab.com/ee/ci/variables/#cicd-variable-precedence
           variables.concat(project.predefined_variables)
+          variables.concat(pipeline_predefined_variables(ref: ref))
           variables.concat(project.ci_instance_variables_for(ref: ref))
           variables.concat(project.group.ci_variables_for(ref, project)) if project.group
           variables.concat(project.ci_variables_for(ref: ref))
         end
       end
 
+      # https://gitlab.com/gitlab-org/gitlab/-/issues/337633 aims to add all predefined variables
+      # to this list, but only CI_COMMIT_REF_NAME is available right now to support compliance pipelines.
+      def pipeline_predefined_variables(ref:)
+        Gitlab::Ci::Variables::Collection.new.tap do |v|
+          v.append(key: 'CI_COMMIT_REF_NAME', value: ref)
+        end
+      end
+
       def track_and_raise_for_dev_exception(error)
         Gitlab::ErrorTracking.track_and_raise_for_dev_exception(error, @context.sentry_payload)
       end

spec/lib/gitlab/usage_data_counters/ci_template_unique_counter_spec.rb

@@ -60,7 +60,7 @@ RSpec.describe Gitlab::UsageDataCounters::CiTemplateUniqueCounter do
           Gitlab::Ci::Pipeline::Chain::Config::Content::AutoDevops.new(pipeline, command).content,
           project: project,
           user: double,
-          sha: double
+          sha: 'd310cc759caaa20cd05a9e0983d6017896d9c34c'
         ).execute
 
         config_source = :auto_devops_source