Add tag for migrated s390x CI pipeline on Jenkins

This commit adds the appropriate tag to support the newly migrated Continuous Integration (CI) pipeline for the s390x architecture on Jenkins.
Signed-off-by: Firoj-IBM <98873158+Firoj-Patel@users.noreply.github.com>

Author: Firoj-Patel

README.md

@@ -8,6 +8,7 @@
 [![License](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](http://www.apache.org/licenses/LICENSE-2.0)
 [![Twitter Follow](https://img.shields.io/twitter/follow/strimziio?style=social)](https://twitter.com/strimziio)
 [![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/strimzi-kafka-operator)](https://artifacthub.io/packages/search?repo=strimzi-kafka-operator)
+[![s390x build Status](https://ibmz-ci.osuosl.org/job/Strimzi_Kafka_Operator_IBMZ_CI/badge/icon)](https://ibmz-ci.osuosl.org/job/Strimzi_Kafka_Operator_IBMZ_CI/)
 
 Strimzi provides a way to run an [Apache Kafka®][kafka] cluster on 
 [Kubernetes][k8s] or [OpenShift][os] in various deployment configurations.