prom-wrapper: fix conf usage
Created by: bobheadxi
due to changes related to https://github.com/sourcegraph/sourcegraph/issues/29222, it looks like prom-wrapper
is no longer using conf
correctly and requires a call to conf.Init
somewhere. This is causing all alerting to break for all sourcegraph instances as of 3.38 (see https://github.com/sourcegraph/sourcegraph/issues/33394)
closes https://github.com/sourcegraph/sourcegraph/issues/33394
Test plan
apply in demo.sourcegraph.com