Use omnibus-gitlab-mirror for triggering package builds

Signed-off-by: Balasankar "Balu" C <balasankar@gitlab.com>

scripts/trigger-build

@@ -90,7 +90,7 @@ module Trigger
     private
 
     def downstream_project_path
-      'gitlab-org/omnibus-gitlab'
+      ENV['OMNIBUS_PROJECT_PATH'] || 'gitlab-org/build/omnibus-gitlab-mirror'
     end
 
     def ref
@@ -98,7 +98,7 @@ module Trigger
     end
 
     def trigger_token
-      ENV['BUILD_TRIGGER_TOKEN']
+      ENV['CI_JOB_TOKEN']
     end
 
     def access_token