Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -6,6 +6,7 @@ variables:
   DETECTOR_REPOSITORYURL: 'https://github.com/eic/epic.git'
   GITHUB_SHA: ''
   GITHUB_REPOSITORY: ''
+  RM: ''
 
 workflow:
   name: '$PIPELINE_NAME'
@@ -70,8 +71,6 @@ stages:
 
 common:setup:
   stage: config
-  variables:
-    - RM: ""
   before_script:
   script:
     - |