cicd: removed windows linebreak

.gitlab-ci.yml

@@ -8,7 +8,7 @@ deploy_staging:
   environment: staging
   script:
     - echo $APP_CONFIG > config.json
-    - echo $SSH_PRIVATE_KEY > gitlab.key && sed -i 's/\r /\n/g' gitlab.key && chmod 600 gitlab.key
+    - echo $SSH_PRIVATE_KEY | tr -d '\r' > gitlab.key && chmod 600 gitlab.key
     - cat gitlab.key
     - npm install
     - npm run build