Add job scheduler plugin to test cluster (#2957)

Signed-off-by: Louis Chu <clingzhi@amazon.com>

Author: noCharger

plugin/build.gradle

@@ -1,3 +1,5 @@
+import java.util.concurrent.Callable
+
 /*
  * Copyright OpenSearch Contributors
  * SPDX-License-Identifier: Apache-2.0
@@ -114,6 +116,11 @@ configurations.all {
     resolutionStrategy.force "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.9.10"
     resolutionStrategy.force "org.jetbrains.kotlin:kotlin-stdlib-common:1.9.10"
 }
+
+configurations {
+    zipArchive
+}
+
 compileJava {
     options.compilerArgs.addAll(["-processor", 'lombok.launch.AnnotationProcessorHider$AnnotationProcessor'])
 }
@@ -162,6 +169,8 @@ dependencies {
     testImplementation group: 'org.mockito', name: 'mockito-core', version: "${versions.mockito}"
     testImplementation group: 'org.mockito', name: 'mockito-junit-jupiter', version: "${versions.mockito}"
     testImplementation 'org.junit.jupiter:junit-jupiter:5.9.3'
+
+    zipArchive group: 'org.opensearch.plugin', name:'opensearch-job-scheduler', version: "${opensearch_build}"
 }
 
 test {
@@ -276,7 +285,24 @@ afterEvaluate {
     }
 }
 
+def getJobSchedulerPlugin() {
+    provider(new Callable<RegularFile>() {
+        @Override
+        RegularFile call() throws Exception {
+            return new RegularFile() {
+                @Override
+                File getAsFile() {
+                    return configurations.zipArchive.asFileTree.matching {
+                        include '**/opensearch-job-scheduler*'
+                    }.singleFile
+                }
+            }
+        }
+    })
+}
+
 testClusters.integTest {
+    plugin(getJobSchedulerPlugin())
     plugin(project.tasks.bundlePlugin.archiveFile)
     testDistribution = "ARCHIVE"