Network Operator is degraded after adding a custom PKI

Issue

• The Network Operator becomes degraded after adding a custom PKI post-installation. The following error is displayed:

  The configuration is invalid for proxy 'cluster' (failed to validate trust bundle for proxy trustedCA 'custom-ca': failed parsing certificate data from ConfigMap "custom-ca": failed to parse certificate PEM).
  

• openssl verifyshows the certificate verification failed with error 18:

  error 18 at 0 depth lookup: self signed certificate
  error stdin: verification failed