Reporting operator is showing "500 Internal Error certificate authority file (/etc/pki/tls/cert.pem) could not be read"

Issue

• when deploying metering operator, we can see in the logs:

metering-openshift-metering.apps.czchooct001.dhl.com GET - "/oauth/start?rd=%2F" HTTP/1.1 "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.125 Safari/537.36" 500 62368 0.000
2020/09/30 14:46:26 oauthproxy.go:438: ErrorPage 500 Internal Error certificate authority file (/etc/pki/tls/cert.pem) could not be read - open /etc/pki/tls/cert.pem: no such file or directory