Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -184,9 +184,7 @@ deploy_dev:
   environment:
     name: dev
     url: https://ecolyo.dev.cozy.self-data.alpha.grandlyon.com/
-  when:
-    variables:
-      - ${CI_MERGE_REQUEST_LABELS} contains "deploy to dev"
+  when: manual
 
 deploy_demo:
   stage: deploy