Merge branch 'improve-deploy-message' into 'master'

Improve deploy message

## What does this MR do?
Improves deploy message to make it more descriptive and useable then what is already offered by deploy command.

## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See merge request !7629

2 files changed, 20 insertions, 2 deletions

diff --git a/lib/gitlab/chat_commands/deploy.rb b/lib/gitlab/chat_commands/deploy.rb
index c0b93cca68c..0eed1fce0dc 100644
--- a/lib/gitlab/chat_commands/deploy.rb
+++ b/lib/gitlab/chat_commands/deploy.rb
@@ -1,6 +1,8 @@
 module Gitlab
   module ChatCommands
     class Deploy < BaseCommand
+      include Gitlab::Routing.url_helpers
+
       def self.match(text)
         /\Adeploy\s+(?<from>.*)\s+to+\s+(?<to>.*)\z/.match(text)
       end
@@ -25,7 +27,7 @@ module Gitlab
         return unless actions.present?
 
         if actions.one?
-          actions.first.play(current_user)
+          play!(from, to, actions.first)
         else
           Result.new(:error, 'Too many actions defined')
         end
@@ -33,12 +35,23 @@ module Gitlab
 
       private
 
+      def play!(from, to, action)
+        new_action = action.play(current_user)
+
+        Result.new(:success, "Deployment from #{from} to #{to} started. Follow the progress: #{url(new_action)}.")
+      end
+
       def find_actions(from, to)
         environment = project.environments.find_by(name: from)
         return unless environment
 
         environment.actions_for(to).select(&:starts_environment?)
       end
+
+      def url(subject)
+        polymorphic_url(
+          [ subject.project.namespace.becomes(Namespace), subject.project, subject ])
+      end
     end
   end
 end
diff --git a/lib/mattermost/presenter.rb b/lib/mattermost/presenter.rb
index 6b12081575d..67eda983a74 100644
--- a/lib/mattermost/presenter.rb
+++ b/lib/mattermost/presenter.rb
@@ -49,7 +49,12 @@ module Mattermost
       private
 
       def show_result(result)
-        ephemeral_response(result.message)
+        case result.type
+        when :success
+          in_channel_response(result.message)
+        else
+          ephemeral_response(result.message)
+        end
       end
 
       def not_found