[Enhancement] Add CORS headers to blog RSS feed

[not7cd]

Description

I wanted to add News feed in my Grafana dashboard to not miss any minor update. Unfortunately, it's not working. Grafana points out to lack of CORS headers since in recent versions the frontend handles News panel.

See: https://cors-test.codehappy.dev/?url=https%3A%2F%2Fkyverno.io%2Fblog%2Findex.xml&origin=https%3A%2F%2Fcors-test.codehappy.dev%2F&method=get

Slack discussion

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