Make the prometheus sidecar image dynamic

[cbid71]

Hello,

In the submodule modules/v2 the image of the prometheus sidecar is currently hardcoded into a public registry.
For specific usages it could be interesting to be able to overload this registry for a custom one.

[cbid71]

And here the associated PR : #452

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days