Ensure that jarmode jar added to an app has same SHA as published jar

Closes gh-31862

spring-boot-project/spring-boot-tools/spring-boot-jarmode-layertools/build.gradle

@@ -15,3 +15,8 @@ dependencies {
 	testImplementation("org.mockito:mockito-core")
 	testImplementation("org.mockito:mockito-junit-jupiter")
 }
+
+jar {
+	reproducibleFileOrder = true
+	preserveFileTimestamps = false
+}

spring-boot-project/spring-boot-tools/spring-boot-loader-tools/build.gradle

@@ -49,23 +49,18 @@ task reproducibleLoaderJar(type: Jar) {
 	destinationDirectory = file("${generatedResources}/META-INF/loader")
 }
 
-task reproducibleJarModeLayerToolsJar(type: Jar) {
+task layerToolsJar(type: Sync) {
 	dependsOn configurations.jarmode
 	from {
-		zipTree(configurations.jarmode.incoming.files.singleFile).matching {
-			exclude "META-INF/LICENSE.txt"
-			exclude "META-INF/NOTICE.txt"
-		}
+		file(configurations.jarmode.incoming.files.singleFile)
 	}
-	reproducibleFileOrder = true
-	preserveFileTimestamps = false
-	archiveFileName = "spring-boot-jarmode-layertools.jar"
-	destinationDirectory = file("${generatedResources}/META-INF/jarmode")
+	rename({ "spring-boot-jarmode-layertools.jar" })
+	into(file("${generatedResources}/META-INF/jarmode"))
 }
 
 sourceSets {
 	main {
-		output.dir(generatedResources, builtBy: [reproducibleJarModeLayerToolsJar, reproducibleLoaderJar])
+		output.dir(generatedResources, builtBy: [layerToolsJar, reproducibleLoaderJar])
 	}
 }