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

3 files changed, 41 insertions, 2 deletions

diff --git a/app/models/deployment.rb b/app/models/deployment.rb
index 3d9902d496e..1f8c5fb3d85 100644
--- a/app/models/deployment.rb
+++ b/app/models/deployment.rb
@@ -34,7 +34,7 @@ class Deployment < ActiveRecord::Base
   end
 
   def manual_actions
-    deployable.try(:other_actions)
+    @manual_actions ||= deployable.try(:other_actions)
   end
 
   def includes_commit?(commit)
@@ -84,6 +84,17 @@ class Deployment < ActiveRecord::Base
       take
   end
 
+  def stop_action
+    return nil unless on_stop.present?
+    return nil unless manual_actions
+
+    @stop_action ||= manual_actions.find_by(name: on_stop)
+  end
+
+  def stoppable?
+    stop_action.present?
+  end
+
   def formatted_deployment_time
     created_at.to_time.in_time_zone.to_s(:medium)
   end
diff --git a/app/models/environment.rb b/app/models/environment.rb
index d970bc0a005..d575f1dc73a 100644
--- a/app/models/environment.rb
+++ b/app/models/environment.rb
@@ -19,6 +19,24 @@ class Environment < ActiveRecord::Base
             allow_nil: true,
             addressable_url: true
 
+  delegate :stop_action, to: :last_deployment, allow_nil: true
+
+  scope :available, -> { with_state(:available) }
+  scope :stopped, -> { with_state(:stopped) }
+
+  state_machine :state, initial: :available do
+    event :start do
+      transition stopped: :available
+    end
+
+    event :stop do
+      transition available: :stopped
+    end
+
+    state :available
+    state :stopped
+  end
+
   def last_deployment
     deployments.last
   end
@@ -66,4 +84,14 @@ class Environment < ActiveRecord::Base
 
     external_url.gsub(/\A.*?:\/\//, '')
   end
+
+  def stoppable?
+    available? && stop_action.present?
+  end
+
+  def stop!(current_user)
+    return unless stoppable?
+
+    stop_action.play(current_user)
+  end
 end
diff --git a/app/models/project.rb b/app/models/project.rb
index aee74c3dba1..db7301219e5 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -1293,7 +1293,7 @@ class Project < ActiveRecord::Base
         environment_ids.where(ref: ref)
       end
 
-    environments.where(id: environment_ids).select do |environment|
+    environments.available.where(id: environment_ids).select do |environment|
       environment.includes_commit?(commit)
     end
   end