refactor(ci): prevent concurrent executions with resource_group

.gitlab-ci.yml

@@ -28,6 +28,7 @@ build_stage:
 # define the deploy stage
 deploy_staging:
   stage: deploy
+  resource_group: staging
   environment:
     name: staging
     url: https://next.rockfic.com
@@ -55,6 +56,7 @@ deploy_staging:
     - tags
 deploy_production:
   stage: deploy
+  resource_group: production
   environment:
     name: production
     url: https://www.rockfic.com