Only publish charts on new tags to ensure uniqueness

.gitlab-ci.yml

@@ -14,7 +14,7 @@ publish-helm-chart:
     - "upload_filename=$(helm package . | sed 's/^Successfully packaged chart and saved it to: \\(.*\\)/\\1/')"
     - curl -u $HELM_CHART_REPOSITORY_CREDENTIALS -v -X POST https://charts-public.hub.eox.at/api/charts --data-binary "@${upload_filename}"
   only:
-    - main
+    - tag
 
 integration-test:
   image: registry.gitlab.eox.at/vs/vs-deployment/docker-base-testing:latest