Make bootBuildImage produce native image when NBT plugin is applied

Closes gh-32768

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/plugin/NativeImagePluginActionIntegrationTests-bootBuildImageIsConfiguredToBuildANativeImage.gradle

@@ -0,0 +1,13 @@
+plugins {
+	id 'org.springframework.boot' version '{version}'
+	id 'java'
+}
+
+apply plugin: 'org.graalvm.buildtools.native'
+
+task('bootBuildImageConfiguration') {
+	doFirst {
+		println "builder = ${tasks.getByName('bootBuildImage').builder}"
+		println "BP_NATIVE_IMAGE = ${tasks.getByName('bootBuildImage').environment['BP_NATIVE_IMAGE']}"
+	}
+}