Add path as an option for prometheus.internal if behind a reverse proxy(mimir) #270
Description
When querying prometheus behind a reverse proxy such as The mimir-query-frontend we need to specify the path to prometheus.
ie /prometheus
If prometheus is external then you can set it in the url:
opencost.prometheus.external.url: https://example.com/prometheus
But if you are querying prometheus in the cluster there currently is no option.
This PR resolves that issue by allowing it to be set here -> opencost.prometheus.internal.path