1. Proposed title of this feature request

Add image push field in BuildConfig definition
2. What is the nature and description of the request?

Since OCP 4.15, a change was done to check ImagePullSecrets field for pull/push tasks:

Previously, the build controller looked for secrets that were linked for general use, not specifically for the image pull. With this release, when searching for default image pull secrets, the builds use ImagePullSecrets that are linked to the service account. (OCPBUGS-54344) 

The push and pull secrets should be defined in separate fields to avoid confusion
3. Why does the customer need this? (List the business requirements here)

Unclear config
4. List any affected packages or components.

BuildConfig