Merge pull request ppc64le-cloud#539 from Rajalakshmi-Girish/fix-openshift-origin

Change branch from master to main for postsubmit-os-origin-build-golang-master-ppc64le job

Author: ppc64le-cloud-bot

config/jobs/ppc64le-cloud/builds/openshift-postsubmit.yaml

@@ -64,7 +64,7 @@ postsubmits:
         - master
       run_if_changed: '^golang/master/'
       extra_refs:
-        - base_ref: master
+        - base_ref: main
           org: openshift
           repo: origin
           workdir: true