In the following document

https://access.redhat.com/documentation/en-us/red_hat_process_automation_manager/7.10/html/deploying_red_hat_process_automation_manager_on_red_hat_openshift_container_platform/operator-con_openshift-operator#customimage-rpm-proc_openshift-operator

there is an example when building custom image, which is using yum in step3.

FROM registry.redhat.io/rhpam-7/rhpam-kieserver-rhel8:7.10.0
USER root
RUN yum -y install procps-ng
USER 185

But yum is no longer available in 7.10.0 image as base image was changed to ubi8-mininal  by  KIECLOUD-466.

Here is an example correction:

FROM registry.redhat.io/rhpam-7/rhpam-kieserver-rhel8:7.10.0
USER root
RUN microdnf install procps-ng
USER 185