UPSTREAM: <carry>: Add OpenShift tooling, images, configs and docs

Author: bertinatto

staging/src/k8s.io/code-generator/examples/hack/verify-codegen.sh

@@ -44,6 +44,8 @@ else
 fi
 
 # smoke test
+GOFLAGS=-mod=readonly
+
 echo "Smoke testing examples by compiling..."
 pushd "${SCRIPT_ROOT}"
   go build "k8s.io/code-generator/examples/crd/..."