Missing index file at helm repo leads to issues with JFrog Artficatory

[ntap-johanneswagner]

Describe the bug
Please see https://jfrog.atlassian.net/browse/RTFACT-21534 which describes what's happening in a good way. Besides the point that this behavior should be fixed in Artifactory anyway, we should think about whether adding an index file to https://netapp.github.io/trident-helm-chart/ would be a good idea to avoid hitting this bug.

To Reproduce
curl -v https://netapp.github.io/trident-helm-chart => shouldn't return an Error 404

Expected behavior
curl -v https://netapp.github.io/trident-helm-chart should return a success code