Merge branch 'cng-repo-env-variable' into 'master'

Make CNG_PROJECT_PATH configurable for releasing helm charts

Closes charts/gitlab#644

See merge request gitlab-org/gitlab-ee!6760

.gitlab-ci.yml

@@ -433,7 +433,7 @@ cloud-native-image:
     SCRIPT_NAME: trigger-build
   script:
     - gem install gitlab --no-document
-    - BUILD_TRIGGER_TOKEN=$CI_JOB_TOKEN ./$SCRIPT_NAME cng
+    - CNG_PROJECT_PATH="gitlab-org/build/CNG" BUILD_TRIGGER_TOKEN=$CI_JOB_TOKEN ./$SCRIPT_NAME cng
   only:
     - tags@gitlab-org/gitlab-ce
     - tags@gitlab-org/gitlab-ee

scripts/trigger-build

@@ -6,7 +6,7 @@ require 'cgi'
 
 module Trigger
   OMNIBUS_PROJECT_PATH = 'gitlab-org/omnibus-gitlab'.freeze
-  CNG_PROJECT_PATH = 'gitlab-org/build/CNG-mirror'.freeze
+  CNG_PROJECT_PATH = ENV['CNG_PROJECT_PATH'] || 'gitlab-org/build/CNG-mirror'.freeze
   TOKEN = ENV['BUILD_TRIGGER_TOKEN']
 
   def self.ee?