Merge branch '22191-delete-dynamic-envs-mr' into 'master'

Delete dynamic environments

- Adds "close environment" action to a merge request
- Adds tabs to environments list
- Adds close button to each environment row in environments list
- Replaces Destroy button with Close button inside an environment
- Adds close button to builds list inside an environment

#### Configuration

In order to enable stopping environments a valid `.gitlab-ci.yml` syntax has to be used:

```
review:
  environment:
    name: review/$app
    on_stop: stop_review

stop_review:
  script: echo Delete My App
  when: manual
  environment:
    name: review/$app
    action: stop
```

This MR requires that `stop_review` has to have: `when`, `environment:name` and `environment:action` defined.
The next MR after this one will verify that and enforce that these settings are configured.

It will also implicitly configure these settings, making it possible to define it like this:

```
review:
  environment:
    name: review/$app
    on_stop: stop_review

stop_review:
  script: echo Delete My App
```

Closes #22191 

See merge request !6669

2 files changed, 46 insertions, 2 deletions

diff --git a/lib/ci/gitlab_ci_yaml_processor.rb b/lib/ci/gitlab_ci_yaml_processor.rb
index 2fd1fced65c..3e33c9399e2 100644
--- a/lib/ci/gitlab_ci_yaml_processor.rb
+++ b/lib/ci/gitlab_ci_yaml_processor.rb
@@ -109,6 +109,7 @@ module Ci
 
         validate_job_stage!(name, job)
         validate_job_dependencies!(name, job)
+        validate_job_environment!(name, job)
       end
     end
 
@@ -150,6 +151,35 @@ module Ci
       end
     end
 
+    def validate_job_environment!(name, job)
+      return unless job[:environment]
+      return unless job[:environment].is_a?(Hash)
+
+      environment = job[:environment]
+      validate_on_stop_job!(name, environment, environment[:on_stop])
+    end
+
+    def validate_on_stop_job!(name, environment, on_stop)
+      return unless on_stop
+
+      on_stop_job = @jobs[on_stop.to_sym]
+      unless on_stop_job
+        raise ValidationError, "#{name} job: on_stop job #{on_stop} is not defined"
+      end
+
+      unless on_stop_job[:environment]
+        raise ValidationError, "#{name} job: on_stop job #{on_stop} does not have environment defined"
+      end
+
+      unless on_stop_job[:environment][:name] == environment[:name]
+        raise ValidationError, "#{name} job: on_stop job #{on_stop} have different environment name"
+      end
+
+      unless on_stop_job[:environment][:action] == 'stop'
+        raise ValidationError, "#{name} job: on_stop job #{on_stop} needs to have action stop defined"
+      end
+    end
+
     def process?(only_params, except_params, ref, tag, trigger_request)
       if only_params.present?
         return false unless matching?(only_params, ref, tag, trigger_request)
diff --git a/lib/gitlab/ci/config/node/environment.rb b/lib/gitlab/ci/config/node/environment.rb
index d388ab6b879..9a95ef43628 100644
--- a/lib/gitlab/ci/config/node/environment.rb
+++ b/lib/gitlab/ci/config/node/environment.rb
@@ -8,7 +8,7 @@ module Gitlab
         class Environment < Entry
           include Validatable
 
-          ALLOWED_KEYS = %i[name url]
+          ALLOWED_KEYS = %i[name url action on_stop]
 
           validations do
             validate do
@@ -35,6 +35,12 @@ module Gitlab
                         length: { maximum: 255 },
                         addressable_url: true,
                         allow_nil: true
+
+              validates :action,
+                        inclusion: { in: %w[start stop], message: 'should be start or stop' },
+                        allow_nil: true
+
+              validates :on_stop, type: String, allow_nil: true
             end
           end
 
@@ -54,9 +60,17 @@ module Gitlab
             value[:url]
           end
 
+          def action
+            value[:action] || 'start'
+          end
+
+          def on_stop
+            value[:on_stop]
+          end
+
           def value
             case @config
-            when String then { name: @config }
+            when String then { name: @config, action: 'start' }
             when Hash then @config
             else {}
             end