Merge branch '5-main_or_master' into 'master'

fix: use master or main for production env

Closes #5

See merge request to-be-continuous/helm!6

templates/gitlab-ci-helm.yml

@@ -76,7 +76,7 @@ variables:
   HELM_REVIEW_ENVIRONMENT_SCHEME: "https"
 
   # default production ref name (pattern)
-  PROD_REF: '/^master$/'
+  PROD_REF: '/^(master|main)$/'
   # default integration ref name (pattern)
   INTEG_REF: '/^develop$/'