Can you add a port for Prometheus monitoring

[sebglon]

Since Metabase 0.44, we can enable prometheus Monitoring endpoint.
But it require to expose the port

Documentation available here: https://www.metabase.com/docs/latest/installation-and-operation/observability-with-prometheus

[pmint93]

@sebglon
I'm not working with metabase for a while, so not sure when I have time to do that. Just here to maintain the chart for community.

It would be great if you or anyone who can contribute !

[sebglon]

Pull request created : #51