DRY the kafka version

Author: jsvd

.ci/run.sh

@@ -5,7 +5,8 @@ env
 
 set -ex
 
-export KAFKA_VERSION=3.9.1
+# Extract apacheKafkaVersion from gradle.properties
+export KAFKA_VERSION=$(grep "^apacheKafkaVersion" ../gradle.properties | cut -d'=' -f2)
 ./kafka_test_setup.sh
 
 bundle exec rspec -fd

build.gradle

@@ -37,10 +37,9 @@ java {
   sourceCompatibility = JavaVersion.VERSION_1_8
 }
 
-// given https://docs.confluent.io/current/installation/versions-interoperability.html matrix
-// Confluent Platform 7.9.x is Apache Kafka 3.9.x
-String confluentKafkaVersion = '7.9.1'
-String apacheKafkaVersion = '3.9.1'
+// Versions are defined in gradle.properties
+String confluentKafkaVersion = project.property('confluentKafkaVersion')
+String apacheKafkaVersion = project.property('apacheKafkaVersion')
 
 repositories {
     mavenCentral()

gradle.properties

@@ -1 +1,7 @@
 org.gradle.daemon=false
+
+# given https://docs.confluent.io/current/installation/versions-interoperability.html matrix
+# Confluent Platform 7.9.x is Apache Kafka 3.9.x
+# Kafka version used by both build.gradle and CI scripts
+apacheKafkaVersion=3.9.1
+confluentKafkaVersion=7.9.1