[CI]: Setup http headers to allow serving vlc.js artifacts

The vlc.js app uses the SharedArrayBuffer object, which needs specific headers in the gitlab instance.

the closest thing I found in the documentation to allow setting custom headers is :

https://docs.gitlab.com/ee/administration/pages/#http-strict-transport-security-hsts-support

The idea is to have these artifacts, served to allow this page to run without errors and without the coi service worker.