15.2.

$ RELEASE_IMAGE=$(./openshift-install version | awk '/release image/ {print $3}')

$ oc adm release extract \
  --from=$RELEASE_IMAGE \
  --credentials-requests \
  --included \1
  --to=<path_to_directory_for_credentials_requests> 2

$ ccoctl gcp delete \
  --name=<name> \1
  --project=<gcp_project_id> \2
  --credentials-requests-dir=<path_to_credentials_requests_directory> \
  --force-delete-custom-roles 3