Switch to branch main instead of master

Configuration/GitLab/t3o-builds.yml

@@ -106,13 +106,13 @@ layout:
   dependencies:
     - layout
 
-deploy-master:
+deploy-main:
   <<: *deploy_template
   environment:
-    name: master
+    name: main
     url: https://${PRODUCTION_HOST}
   only:
-    - master
+    - main
 
 deploy-develop:
   <<: *deploy_template