Merge branch '3-main_or_master' into 'master'

fix: use master or main for production env

Closes #3

See merge request to-be-continuous/gcloud!3

templates/gitlab-ci-gcloud.yml

@@ -23,7 +23,7 @@ variables:
   GCP_REVIEW_ENVIRONMENT_SCHEME: "https"
 
   # default production ref name (pattern)
-  PROD_REF: '/^master$/'
+  PROD_REF: '/^(master|main)$/'
   # default integration ref name (pattern)
   INTEG_REF: '/^develop$/'