fix: use master or main for production env

templates/gitlab-ci-python.yml

@@ -24,7 +24,7 @@ variables:
   TEST_REQUIREMENTS_FILE: test-requirements.txt
   SETUP_PY_DIR: "."
   # default production ref name (pattern)
-  PROD_REF: '/^master$/'
+  PROD_REF: '/^(master|main)$/'
   # default integration ref name (pattern)
   INTEG_REF: '/^develop$/'