Redo using reference instead of anchor

ci-templates/core.yml

@@ -15,8 +15,9 @@ services:
   - name: tecnalia-docker-dev.artifact.tecnalia.com/docker:dind
     alias: docker
 
-.lfs_setup_template: &lfs_setup_definition # Hidden key that defines an anchor
-  AFTER_SETUP_UPSTREAM_WORKSPACE: "bash <(curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh);\
+.lfs_setup_template:
+  variables:
+    AFTER_SETUP_UPSTREAM_WORKSPACE: "bash <(curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh);\
                   apt install -qq -y git-lfs; \
                   git config --global credential.helper store; \
                   echo https://$ARTIFACT_CI_USER:$ARTIFACT_CI_TOKEN@artifact.tecnalia.com > ~/.git-credentials ;\