fix: long branch names prevent review deployment

.gitlab-ci.yml

@@ -80,7 +80,7 @@ build:
   rules: &deploy-rules
     - if: $CI_PIPELINE_SOURCE == 'merge_request_event'
       variables:
-        DEPLOY_ID: $CI_MERGE_REQUEST_SOURCE_BRANCH_NAME
+        DEPLOY_ID: $CI_MERGE_REQUEST_IID
     - if: $CI_COMMIT_BRANCH == 'main'
       variables:
         DEPLOY_ID: production