Update related stage status when job status is changed

app/models/ci/stage.rb

@@ -17,6 +17,8 @@ module Ci
     validates :pipeline, presence: true, unless: :importing?
     validates :name, presence: true, unless: :importing?
+    ## TODO, should we extract these events to `Ci::Eventable`?
+    #
     state_machine :status, initial: :created do
       event :enqueue do
         transition created: :pending

app/models/commit_status.rb

@@ -91,6 +91,7 @@ class CommitStatus < ActiveRecord::Base
           end
         end
+        StageUpdateWorker.perform_async(commit_status.stage_id)
         ExpireJobCacheWorker.perform_async(commit_status.id)
       end
     end