[kafka] remove KRaft mode support workarounds

as the latest confluentinc/cp-kafka:7.4.0-1-ubi8
already provides built-in support

src/kafka/Dockerfile

@@ -10,9 +10,6 @@ ADD https://github.com/open-telemetry/opentelemetry-java-instrumentation/release
 RUN chmod go+r /tmp/opentelemetry-javaagent.jar
 
 USER appuser
-WORKDIR /tmp
-COPY ./src/kafka/clusterID clusterID
-COPY ./src/kafka/update_run.sh update_run.sh
 
 ENV KAFKA_LISTENERS=PLAINTEXT://0.0.0.0:9092,CONTROLLER://0.0.0.0:9093
 ENV KAFKA_CONTROLLER_QUORUM_VOTERS='1@0.0.0.0:9093'
@@ -28,5 +25,4 @@ ENV KAFKA_AUTO_CREATE_TOPICS_ENABLE=true
 ENV KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR=1
 ENV KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR=1
 ENV KAFKA_OPTS="-javaagent:/tmp/opentelemetry-javaagent.jar -Dotel.jmx.target.system=kafka-broker"
-
-ENTRYPOINT ["/bin/sh", "-c", "ls -lh /tmp && /tmp/update_run.sh && /etc/confluent/docker/run"]
+ENV CLUSTER_ID=ckjPoprWQzOf0-FuNkGfFQ

src/kafka/README.md

@@ -3,8 +3,5 @@
 This is used as a message queue service to connect the checkout service with
 the accounting and fraud detection services.
 
-## KRaft: Kafka without ZooKeeper
-
-Kafka is run in KRaft mode. The `update_run.sh` script is used to configure
-the system to run Kafka in this mode. Environment variables are substituted at
+Kafka is run in KRaft mode. Environment variables are substituted at
 deploy-time.