Change logic of repo name and slugs in docs review script

We need to make room for Runner and Omnibus docs.
This change makes sure the correct values are defined
based on CI_PROJECT_NAME.

scripts/trigger-build-docs

@@ -30,13 +30,6 @@ def docs_branch
   "preview-#{ENV["CI_COMMIT_REF_SLUG"]}"[0...max]
 end
 
-#
-# Dummy way to find out in which repo we are, CE or EE
-#
-def ee?
-  File.exist?('CHANGELOG-EE.md')
-end
-
 #
 # Create a remote branch in gitlab-docs
 #
@@ -55,15 +48,35 @@ def remove_remote_branch
   puts "Remote branch '#{docs_branch}' deleted"
 end
 
+#
+# Define suffix in review app URL based on project
+#
+def slug
+  case ENV["CI_PROJECT_NAME"]
+  when 'gitlab-ce'
+    'ce'
+  when 'gitlab-ee'
+    'ee'
+  when 'gitlab-runner'
+    'runner'
+  when 'omnibus-gitlab'
+    'omnibus'
+  end
+end
+
+#
+# Overriding vars in https://gitlab.com/gitlab-com/gitlab-docs/blob/master/.gitlab-ci.yml
+#
+def param_name
+  "BRANCH_#{slug.upcase}"
+end
+
 #
 # Trigger a pipeline in gitlab-docs
 #
 def trigger_pipeline
-  # Overriding vars in https://gitlab.com/gitlab-com/gitlab-docs/blob/master/.gitlab-ci.yml
-  param_name = ee? ? 'BRANCH_EE' : 'BRANCH_CE'
-
   # The review app URL
-  app_url = "http://#{docs_branch}.#{ENV["DOCS_REVIEW_APPS_DOMAIN"]}/#{ee? ? 'ee' : 'ce'}"
+  app_url = "http://#{docs_branch}.#{ENV["DOCS_REVIEW_APPS_DOMAIN"]}/#{slug}"
 
   # Create the pipeline
   puts "=> Triggering a pipeline..."