OCPBUGS-16720: openshift-api 4.12 - fix verify-client-go target (openshift#41632)

* openshift-api 4.12 - fix verify-clien-go target

* Update ci-operator/config/openshift/api/openshift-api-release-4.12.yaml

Co-authored-by: Joel Speed <[email protected]>

---------

Co-authored-by: Joel Speed <[email protected]>

Author: tremes

ci-operator/config/openshift/api/openshift-api-release-4.12.yaml

@@ -49,7 +49,7 @@ tests:
 - as: verify-client-go
   commands: |
     dir=$GOPATH/src/github.com/openshift/client-go
-    git clone https://github.com/openshift/client-go $dir
+    git clone https://github.com/openshift/client-go --branch ${PULL_BASE_REF:-master} --single-branch $dir
     rm -rf $dir/vendor/github.com/openshift/api/*
     cp -Rf * $dir/vendor/github.com/openshift/api/
     rm -rf $dir/vendor/github.com/openshift/api/vendor