Add deployment tier to predefined CI env variables [RUN ALL RSPEC] [RUN AS-IF-FOSS]

app/models/environment.rb

@@ -223,6 +223,7 @@ class Environment < ApplicationRecord
     Gitlab::Ci::Variables::Collection.new
       .append(key: 'CI_ENVIRONMENT_NAME', value: name)
       .append(key: 'CI_ENVIRONMENT_SLUG', value: slug)
+      .append(key: 'CI_ENVIRONMENT_TIER', value: tier)
   end
 
   def recently_updated_on_branch?(ref)

doc/ci/variables/predefined_variables.md

@@ -53,6 +53,7 @@ There are also [Kubernetes-specific deployment variables](../../user/project/clu
 | `CI_ENVIRONMENT_SLUG`                    | 8.15   | all    | The simplified version of the environment name, suitable for inclusion in DNS, URLs, Kubernetes labels, and so on. Available if [`environment:name`](../yaml/README.md#environmentname) is set. The slug is [truncated to 24 characters](https://gitlab.com/gitlab-org/gitlab/-/issues/20941). |
 | `CI_ENVIRONMENT_URL`                     | 9.3    | all    | The URL of the environment for this job. Available if [`environment:url`](../yaml/README.md#environmenturl) is set. |
 | `CI_ENVIRONMENT_ACTION`                  | 13.11  | all    | The action annotation specified for this job's environment. Available if [`environment:action`](../yaml/README.md#environmentaction) is set. Can be `start`, `prepare`, or `stop`. |
+| `CI_ENVIRONMENT_TIER`                    | 14.0   | all    | The [deployment tier of the environment](../environments/index.md#deployment-tier-of-environments) for this job. |
 | `CI_HAS_OPEN_REQUIREMENTS`               | 13.1   | all    | Only available if the pipeline's project has an open [requirement](../../user/project/requirements/index.md). `true` when available. |
 | `CI_JOB_ID`                              | 9.0    | all    | The internal ID of the job, unique across all jobs in the GitLab instance. |
 | `CI_JOB_IMAGE`                           | 12.9   | 12.9   | The name of the Docker image running the job. |

spec/models/ci/build_spec.rb

@@ -2720,7 +2720,7 @@ RSpec.describe Ci::Build do
           let(:expected_variables) do
             predefined_variables.map { |variable| variable.fetch(:key) } +
               %w[YAML_VARIABLE CI_ENVIRONMENT_NAME CI_ENVIRONMENT_SLUG
-                 CI_ENVIRONMENT_ACTION CI_ENVIRONMENT_URL]
+                 CI_ENVIRONMENT_TIER CI_ENVIRONMENT_ACTION CI_ENVIRONMENT_URL]
           end
 
           before do
@@ -2820,7 +2820,8 @@ RSpec.describe Ci::Build do
       let(:environment_variables) do
         [
           { key: 'CI_ENVIRONMENT_NAME', value: 'production', public: true, masked: false },
-          { key: 'CI_ENVIRONMENT_SLUG', value: 'prod-slug',  public: true, masked: false }
+          { key: 'CI_ENVIRONMENT_SLUG', value: 'prod-slug',  public: true, masked: false },
+          { key: 'CI_ENVIRONMENT_TIER', value: 'production', public: true, masked: false }
         ]
       end
 
@@ -2829,6 +2830,7 @@ RSpec.describe Ci::Build do
                project: build.project,
                name: 'production',
                slug: 'prod-slug',
+               tier: 'production',
                external_url: '')
       end