Merge branch 'add-additional-ce-images-kube-doc' into 'master'

Add updated ce images to kubernetes install doc

See merge request gitlab-org/gitlab-ce!21418

doc/install/kubernetes/gitlab_chart.md

@@ -123,6 +123,8 @@ To deploy the Community Edition, include these options in your `helm install` co
 --set gitlab.migrations.image.repository=registry.gitlab.com/gitlab-org/build/cng/gitlab-rails-ce
 --set gitlab.sidekiq.image.repository=registry.gitlab.com/gitlab-org/build/cng/gitlab-sidekiq-ce
 --set gitlab.unicorn.image.repository=registry.gitlab.com/gitlab-org/build/cng/gitlab-unicorn-ce
+--set gitlab.unicorn.workhorse.image=registry.gitlab.com/gitlab-org/build/cng/gitlab-workhorse-ce
+--set gitlab.task-runner.image.repository=registry.gitlab.com/gitlab-org/build/cng/gitlab-task-runner-ce
 ```
 
 ## Updating GitLab using the Helm Chart