Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -23,9 +23,7 @@ singularity-image:
     changes:
       - .gitlab-ci.yml
       - env/*
-   rules:
-        - if: '$CI_MERGE_REQUEST_TARGET_BRANCH_NAME == "master"'
-        - if: "$CI_COMMIT_BRANCH == 'master'" 
+
 # Push the image template.sif on the registry
 deploy:
    stage: deploy