fix(publish): remove variable from rules:exists expression (unsupported)

templates/gitlab-ci-helm.yml

@@ -663,15 +663,16 @@ helm-publish:
   stage: publish
   script:
     - helm ${TRACE+--debug} $(get_helm_config_opt) repo index $HELM_PUBLISH_DIR --url $HELM_PUBLISH_URL $HELM_PUBLISH_ARGS
-  rules:
-    - if: $CI_MERGE_REQUEST_ID || $HELM_PUBLISH_URL == null || $CI_COMMIT_REF_NAME !~ $PROD_REF
-      when: never
-    - exists:
-        - $HELM_CHART_DIR/Chart.yaml
   artifacts:
     expire_in: 1 week
     paths:
       - $HELM_PUBLISH_DIR
+  rules:
+    - if: $CI_MERGE_REQUEST_ID || $HELM_PUBLISH_URL == null || $CI_COMMIT_REF_NAME !~ $PROD_REF
+      when: never
+    # /!\ variables can't be used in rules:exists
+    - exists:
+        - "**/Chart.yaml"
 
 # Deploy job prototype
 # Can be extended to define a concrete environment