Add gradle9 module: Spring Boot 4 build migrated from Gradle 8 to Gradle 9

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Gth99spB1CzQmBFofXmU4Z

gradle9/before/build.gradle

@@ -0,0 +1,31 @@
+plugins {
+    id 'java'
+    id 'org.springframework.boot' version '4.1.1'
+    id 'io.spring.dependency-management' version '1.1.7'
+}
+
+group = 'com.ankurm'
+version = '0.0.1'
+sourceCompatibility = '17'
+archivesBaseName = 'g9demo-legacy'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'org.springframework.boot:spring-boot-starter-webmvc'
+    testImplementation 'org.springframework.boot:spring-boot-starter-webmvc-test'
+}
+
+// Task that reads the project model and an environment variable while it EXECUTES
+tasks.register('buildInfo') {
+    doLast {
+        def stamp = System.getenv('BUILD_STAMP') ?: 'local'
+        file("$buildDir/build-info.txt").text = "${project.name} ${project.version} ${stamp}\n"
+    }
+}
+
+tasks.named('test') {
+    useJUnitPlatform()
+}